1.
DOS
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None of these systems were officially named DOS, and indeed DOS is a general term for disk operating system. MS-DOS dominated the IBM PC compatible market between 1981 and 1995, and Microsoft Windows, still ran on top of it until about 2001, dozens of other operating systems also use the acronym DOS, including DOS/360 from 1966. Others are Apple DOS, Apple ProDOS, Atari DOS, Commodore DOS, TRSDOS, see List of DOS operating systems § Other operating systems. IBM PC DOS and its predecessor, 86-DOS, resembled Digital Researchs CP/M—the dominant disk operating system for 8-bit Intel 8080, DOS instead ran on Intel 8086 16-bit processors. Starting with MS-DOS1.28 and PC DOS2.0 the operating system incorporated various features inspired by Xenix, when IBM introduced the IBM PC, built with the Intel 8088 microprocessor, they needed an operating system. Seeking an 8088-compatible build of CP/M, IBM initially approached Microsoft CEO Bill Gates, IBM was sent to Digital Research, and a meeting was set up. However, the negotiations for the use of CP/M broke down, Digital Research wished to sell CP/M on a royalty basis, while IBM sought a single license. Digital Research founder Gary Kildall refused, and IBM withdrew, Gates in turn approached Seattle Computer Products. There, programmer Tim Paterson had developed a variant of CP/M-80, the system was initially named QDOS, before being made commercially available as 86-DOS. Microsoft purchased 86-DOS, allegedly for $50,000 and this became Microsoft Disk Operating System, MS-DOS, introduced in 1981. Within a year Microsoft licensed MS-DOS to over 70 other companies, Microsoft later required the use of the MS-DOS name, with the exception of the IBM variant. IBM continued to develop their version, PC DOS, for the IBM PC, Digital Research became aware that an operating system similar to CP/M was being sold by IBM, and threatened legal action. IBM responded by offering an agreement, they would give PC consumers a choice of PC DOS or CP/M-86, side-by-side, CP/M cost almost $200 more than PC DOS, and sales were low. CP/M faded, with MS-DOS and PC DOS becoming the operating system for PCs. Microsoft originally sold MS-DOS only to original equipment manufacturers, one major reason for this was that not all early PCs were 100% IBM PC compatible. DOS was structured such that there was a separation between the specific device driver code and the DOS kernel. Microsoft provided an OEM Adaptation Kit which allowed OEMs to customize the device driver code to their particular system, by the early 1990s, most PCs adhered to IBM PC standards so Microsoft began selling MS-DOS in retail with MS-DOS5.0. In the mid-1980s Microsoft developed a version of DOS
2.
Software developer
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A software developer is a person concerned with facets of the software development process, including the research, design, programming, and testing of computer software. Other job titles which are used with similar meanings are programmer, software analyst. According to developer Eric Sink, the differences between system design, software development, and programming are more apparent, even more so that developers become systems architects, those who design the multi-leveled architecture or component interactions of a large software system. In a large company, there may be employees whose sole responsibility consists of one of the phases above. In smaller development environments, a few people or even an individual might handle the complete process. The word software was coined as a prank as early as 1953, before this time, computers were programmed either by customers, or the few commercial computer vendors of the time, such as UNIVAC and IBM. The first company founded to provide products and services was Computer Usage Company in 1955. The software industry expanded in the early 1960s, almost immediately after computers were first sold in mass-produced quantities, universities, government, and business customers created a demand for software. Many of these programs were written in-house by full-time staff programmers, some were distributed freely between users of a particular machine for no charge. Others were done on a basis, and other firms such as Computer Sciences Corporation started to grow. The computer/hardware makers started bundling operating systems, systems software and programming environments with their machines, new software was built for microcomputers, so other manufacturers including IBM, followed DECs example quickly, resulting in the IBM AS/400 amongst others. The industry expanded greatly with the rise of the computer in the mid-1970s. In the following years, it created a growing market for games, applications. DOS, Microsofts first operating system product, was the dominant operating system at the time, by 2014 the role of cloud developer had been defined, in this context, one definition of a developer in general was published, Developers make software for the world to use. The job of a developer is to crank out code -- fresh code for new products, code fixes for maintenance, code for business logic, bus factor Software Developer description from the US Department of Labor
3.
IBM
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International Business Machines Corporation is an American multinational technology company headquartered in Armonk, New York, United States, with operations in over 170 countries. The company originated in 1911 as the Computing-Tabulating-Recording Company and was renamed International Business Machines in 1924, IBM manufactures and markets computer hardware, middleware and software, and offers hosting and consulting services in areas ranging from mainframe computers to nanotechnology. IBM is also a research organization, holding the record for most patents generated by a business for 24 consecutive years. IBM has continually shifted its business mix by exiting commoditizing markets and focusing on higher-value, also in 2014, IBM announced that it would go fabless, continuing to design semiconductors, but offloading manufacturing to GlobalFoundries. Nicknamed Big Blue, IBM is one of 30 companies included in the Dow Jones Industrial Average and one of the worlds largest employers, with nearly 380,000 employees. Known as IBMers, IBM employees have been awarded five Nobel Prizes, six Turing Awards, ten National Medals of Technology, in the 1880s, technologies emerged that would ultimately form the core of what would become International Business Machines. On June 16,1911, their four companies were amalgamated in New York State by Charles Ranlett Flint forming a fifth company, the Computing-Tabulating-Recording Company based in Endicott, New York. The five companies had 1,300 employees and offices and plants in Endicott and Binghamton, New York, Dayton, Ohio, Detroit, Michigan, Washington, D. C. and Toronto. They manufactured machinery for sale and lease, ranging from commercial scales and industrial time recorders, meat and cheese slicers, to tabulators and punched cards. Thomas J. Watson, Sr. fired from the National Cash Register Company by John Henry Patterson, called on Flint and, Watson joined CTR as General Manager then,11 months later, was made President when court cases relating to his time at NCR were resolved. Having learned Pattersons pioneering business practices, Watson proceeded to put the stamp of NCR onto CTRs companies and his favorite slogan, THINK, became a mantra for each companys employees. During Watsons first four years, revenues more than doubled to $9 million, Watson had never liked the clumsy hyphenated title of the CTR and in 1924 chose to replace it with the more expansive title International Business Machines. By 1933 most of the subsidiaries had been merged into one company, in 1937, IBMs tabulating equipment enabled organizations to process unprecedented amounts of data, its clients including the U. S. During the Second World War the company produced small arms for the American war effort, in 1949, Thomas Watson, Sr. created IBM World Trade Corporation, a subsidiary of IBM focused on foreign operations. In 1952, he stepped down after almost 40 years at the company helm, in 1957, the FORTRAN scientific programming language was developed. In 1961, IBM developed the SABRE reservation system for American Airlines, in 1963, IBM employees and computers helped NASA track the orbital flight of the Mercury astronauts. A year later it moved its headquarters from New York City to Armonk. The latter half of the 1960s saw IBM continue its support of space exploration, on April 7,1964, IBM announced the first computer system family, the IBM System/360
4.
Microsoft
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Its best known software products are the Microsoft Windows line of operating systems, Microsoft Office office suite, and Internet Explorer and Edge web browsers. Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface tablet lineup, as of 2016, it was the worlds largest software maker by revenue, and one of the worlds most valuable companies. Microsoft was founded by Paul Allen and Bill Gates on April 4,1975, to develop and it rose to dominate the personal computer operating system market with MS-DOS in the mid-1980s, followed by Microsoft Windows. The companys 1986 initial public offering, and subsequent rise in its share price, since the 1990s, it has increasingly diversified from the operating system market and has made a number of corporate acquisitions. In May 2011, Microsoft acquired Skype Technologies for $8.5 billion, in June 2012, Microsoft entered the personal computer production market for the first time, with the launch of the Microsoft Surface, a line of tablet computers. The word Microsoft is a portmanteau of microcomputer and software, Paul Allen and Bill Gates, childhood friends with a passion for computer programming, sought to make a successful business utilizing their shared skills. In 1972 they founded their first company, named Traf-O-Data, which offered a computer that tracked and analyzed automobile traffic data. Allen went on to pursue a degree in science at Washington State University. The January 1975 issue of Popular Electronics featured Micro Instrumentation and Telemetry Systemss Altair 8800 microcomputer, Allen suggested that they could program a BASIC interpreter for the device, after a call from Gates claiming to have a working interpreter, MITS requested a demonstration. Since they didnt actually have one, Allen worked on a simulator for the Altair while Gates developed the interpreter and they officially established Microsoft on April 4,1975, with Gates as the CEO. Allen came up with the name of Micro-Soft, as recounted in a 1995 Fortune magazine article. In August 1977 the company formed an agreement with ASCII Magazine in Japan, resulting in its first international office, the company moved to a new home in Bellevue, Washington in January 1979. Microsoft entered the OS business in 1980 with its own version of Unix, however, it was MS-DOS that solidified the companys dominance. For this deal, Microsoft purchased a CP/M clone called 86-DOS from Seattle Computer Products, branding it as MS-DOS, following the release of the IBM PC in August 1981, Microsoft retained ownership of MS-DOS. Since IBM copyrighted the IBM PC BIOS, other companies had to engineer it in order for non-IBM hardware to run as IBM PC compatibles. Due to various factors, such as MS-DOSs available software selection, the company expanded into new markets with the release of the Microsoft Mouse in 1983, as well as with a publishing division named Microsoft Press. Paul Allen resigned from Microsoft in 1983 after developing Hodgkins disease, while jointly developing a new OS with IBM in 1984, OS/2, Microsoft released Microsoft Windows, a graphical extension for MS-DOS, on November 20,1985. Once Microsoft informed IBM of NT, the OS/2 partnership deteriorated, in 1990, Microsoft introduced its office suite, Microsoft Office
5.
Programming language
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A programming language is a formal computer language designed to communicate instructions to a machine, particularly a computer. Programming languages can be used to programs to control the behavior of a machine or to express algorithms. From the early 1800s, programs were used to direct the behavior of such as Jacquard looms. Thousands of different programming languages have created, mainly in the computer field. Many programming languages require computation to be specified in an imperative form while other languages use forms of program specification such as the declarative form. The description of a language is usually split into the two components of syntax and semantics. Some languages are defined by a document while other languages have a dominant implementation that is treated as a reference. Some languages have both, with the language defined by a standard and extensions taken from the dominant implementation being common. A programming language is a notation for writing programs, which are specifications of a computation or algorithm, some, but not all, authors restrict the term programming language to those languages that can express all possible algorithms. For example, PostScript programs are created by another program to control a computer printer or display. More generally, a language may describe computation on some, possibly abstract. It is generally accepted that a specification for a programming language includes a description, possibly idealized. In most practical contexts, a programming language involves a computer, consequently, abstractions Programming languages usually contain abstractions for defining and manipulating data structures or controlling the flow of execution. Expressive power The theory of computation classifies languages by the computations they are capable of expressing, all Turing complete languages can implement the same set of algorithms. ANSI/ISO SQL-92 and Charity are examples of languages that are not Turing complete, markup languages like XML, HTML, or troff, which define structured data, are not usually considered programming languages. Programming languages may, however, share the syntax with markup languages if a computational semantics is defined, XSLT, for example, is a Turing complete XML dialect. Moreover, LaTeX, which is used for structuring documents. The term computer language is used interchangeably with programming language
6.
Assembly language
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Each assembly language is specific to a particular computer architecture. In contrast, most high-level programming languages are generally portable across multiple architectures, Assembly language may also be called symbolic machine code. Assembly language is converted into machine code by a utility program referred to as an assembler. The conversion process is referred to as assembly, or assembling the source code, Assembly time is the computational step where an assembler is run. Assembly language uses a mnemonic to represent each low-level machine instruction or opcode, typically also each architectural register, flag, depending on the architecture, these elements may also be combined for specific instructions or addressing modes using offsets or other data as well as fixed addresses. Many assemblers offer additional mechanisms to facilitate development, to control the assembly process. A macro assembler includes a facility so that assembly language text can be represented by a name. A cross assembler is an assembler that is run on a computer or operating system of a different type from the system on which the code is to run. Cross-assembling facilitates the development of programs for systems that do not have the resources to support software development, a microassembler is a program that helps prepare a microprogram, called firmware, to control the low level operation of a computer. A meta-assembler is a used in some circles for a program that accepts the syntactic and semantic description of an assembly language. An assembler program creates object code by translating combinations of mnemonics and syntax for operations and this representation typically includes an operation code as well as other control bits and data. The assembler also calculates constant expressions and resolves symbolic names for memory locations, the use of symbolic references is a key feature of assemblers, saving tedious calculations and manual address updates after program modifications. Most assemblers also include facilities for performing textual substitution – e. g. to generate common short sequences of instructions as inline. Some assemblers may also be able to some simple types of instruction set-specific optimizations. One concrete example of this may be the ubiquitous x86 assemblers from various vendors, most of them are able to perform jump-instruction replacements in any number of passes, on request. Like early programming languages such as Fortran, Algol, Cobol and Lisp, assemblers have been available since the 1950s, however, assemblers came first as they are far simpler to write than compilers for high-level languages. There may be several assemblers with different syntax for a particular CPU or instruction set architecture, despite different appearances, different syntactic forms generally generate the same numeric machine code, see further below. A single assembler may also have different modes in order to support variations in syntactic forms as well as their exact semantic interpretations, there are two types of assemblers based on how many passes through the source are needed to produce the executable program
7.
C (programming language)
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C was originally developed by Dennis Ritchie between 1969 and 1973 at Bell Labs, and used to re-implement the Unix operating system. C has been standardized by the American National Standards Institute since 1989, C is an imperative procedural language. Therefore, C was useful for applications that had formerly been coded in assembly language. Despite its low-level capabilities, the language was designed to encourage cross-platform programming, a standards-compliant and portably written C program can be compiled for a very wide variety of computer platforms and operating systems with few changes to its source code. The language has become available on a wide range of platforms. In C, all code is contained within subroutines, which are called functions. Function parameters are passed by value. Pass-by-reference is simulated in C by explicitly passing pointer values, C program source text is free-format, using the semicolon as a statement terminator and curly braces for grouping blocks of statements. The C language also exhibits the characteristics, There is a small, fixed number of keywords, including a full set of flow of control primitives, for, if/else, while, switch. User-defined names are not distinguished from keywords by any kind of sigil, There are a large number of arithmetical and logical operators, such as +, +=, ++, &, ~, etc. More than one assignment may be performed in a single statement, function return values can be ignored when not needed. Typing is static, but weakly enforced, all data has a type, C has no define keyword, instead, a statement beginning with the name of a type is taken as a declaration. There is no function keyword, instead, a function is indicated by the parentheses of an argument list, user-defined and compound types are possible. Heterogeneous aggregate data types allow related data elements to be accessed and assigned as a unit, array indexing is a secondary notation, defined in terms of pointer arithmetic. Unlike structs, arrays are not first-class objects, they cannot be assigned or compared using single built-in operators, There is no array keyword, in use or definition, instead, square brackets indicate arrays syntactically, for example month. Enumerated types are possible with the enum keyword and they are not tagged, and are freely interconvertible with integers. Strings are not a data type, but are conventionally implemented as null-terminated arrays of characters. Low-level access to memory is possible by converting machine addresses to typed pointers
8.
Software release life cycle
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Usage of the alpha/beta test terminology originated at IBM. As long ago as the 1950s, IBM used similar terminology for their hardware development, a test was the verification of a new product before public announcement. B test was the verification before releasing the product to be manufactured, C test was the final test before general availability of the product. Martin Belsky, a manager on some of IBMs earlier software projects claimed to have invented the terminology, IBM dropped the alpha/beta terminology during the 1960s, but by then it had received fairly wide notice. The usage of beta test to refer to testing done by customers was not done in IBM, rather, IBM used the term field test. Pre-alpha refers to all activities performed during the project before formal testing. These activities can include requirements analysis, software design, software development, in typical open source development, there are several types of pre-alpha versions. Milestone versions include specific sets of functions and are released as soon as the functionality is complete, the alpha phase of the release life cycle is the first phase to begin software testing. In this phase, developers generally test the software using white-box techniques, additional validation is then performed using black-box or gray-box techniques, by another testing team. Moving to black-box testing inside the organization is known as alpha release, alpha software can be unstable and could cause crashes or data loss. Alpha software may not contain all of the features that are planned for the final version, in general, external availability of alpha software is uncommon in proprietary software, while open source software often has publicly available alpha versions. The alpha phase usually ends with a freeze, indicating that no more features will be added to the software. At this time, the software is said to be feature complete, Beta, named after the second letter of the Greek alphabet, is the software development phase following alpha. Software in the stage is also known as betaware. Beta phase generally begins when the software is complete but likely to contain a number of known or unknown bugs. Software in the phase will generally have many more bugs in it than completed software, as well as speed/performance issues. The focus of beta testing is reducing impacts to users, often incorporating usability testing, the process of delivering a beta version to the users is called beta release and this is typically the first time that the software is available outside of the organization that developed it. Beta version software is useful for demonstrations and previews within an organization
9.
X86
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X86 is a family of backward-compatible instruction set architectures based on the Intel 8086 CPU and its Intel 8088 variant. The term x86 came into being because the names of several successors to Intels 8086 processor end in 86, many additions and extensions have been added to the x86 instruction set over the years, almost consistently with full backward compatibility. The architecture has been implemented in processors from Intel, Cyrix, AMD, VIA and many companies, there are also open implementations. In the 1980s and early 1990s, when the 8088 and 80286 were still in common use, today, however, x86 usually implies a binary compatibility also with the 32-bit instruction set of the 80386. An 8086 system, including such as 8087 and 8089. There were also terms iRMX, iSBC, and iSBX – all together under the heading Microsystem 80, however, this naming scheme was quite temporary, lasting for a few years during the early 1980s. Today, x86 is ubiquitous in both stationary and portable computers, and is also used in midrange computers, workstations, servers. A large amount of software, including operating systems such as DOS, Windows, Linux, BSD, Solaris and macOS, functions with x86-based hardware. There have been attempts, including by Intel itself, to end the market dominance of the inelegant x86 architecture designed directly from the first simple 8-bit microprocessors. Examples of this are the iAPX432, the Intel 960, Intel 860, however, the continuous refinement of x86 microarchitectures, circuitry and semiconductor manufacturing would make it hard to replace x86 in many segments. The table below lists processor models and model series implementing variations of the x86 instruction set, each line item is characterized by significantly improved or commercially successful processor microarchitecture designs. Such x86 implementations are seldom simple copies but often employ different internal microarchitectures as well as different solutions at the electronic, quite naturally, early compatible microprocessors were 16-bit, while 32-bit designs were developed much later. For the personal computer market, real quantities started to appear around 1990 with i386 and i486 compatible processors, other companies, which designed or manufactured x86 or x87 processors, include ITT Corporation, National Semiconductor, ULSI System Technology, and Weitek. Some early versions of these microprocessors had heat dissipation problems, AMD later managed to establish itself as a serious contender with the K6 set of processors, which gave way to the very successful Athlon and Opteron. There were also other contenders, such as Centaur Technology, Rise Technology, VIA Technologies energy efficient C3 and C7 processors, which were designed by the Centaur company, have been sold for many years. Centaurs newest design, the VIA Nano, is their first processor with superscalar and it was, perhaps interestingly, introduced at about the same time as Intels first in-order processor since the P5 Pentium, the Intel Atom. The instruction set architecture has twice been extended to a word size. In 1999-2003, AMD extended this 32-bit architecture to 64 bits and referred to it as x86-64 in early documents, Intel soon adopted AMDs architectural extensions under the name IA-32e, later using the name EM64T and finally using Intel 64
10.
Kernel (operating system)
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The kernel is a computer program that is the core of a computers operating system, with complete control over everything in the system. It is the first program loaded on start-up and it handles the rest of start-up as well as input/output requests from software, translating them into data-processing instructions for the central processing unit. It handles memory and peripherals like keyboards, monitors, printers, the critical code of the kernel is usually loaded into a protected area of memory, which prevents it from being overwritten by applications or other, more minor parts of the operating system. The kernel performs its tasks, such as running processes and handling interrupts, in contrast, everything a user does is in user space, writing text in a text editor, running programs in a GUI, etc. This separation prevents user data and kernel data from interfering with other and causing instability. The kernels interface is an abstraction layer. When a process makes requests of the kernel, it is called a system call, Kernel designs differ in how they manage these system calls and resources. A monolithic kernel runs all the operating instructions in the same address space. A microkernel runs most processes in space, for modularity. The kernel takes responsibility for deciding at any time which of the running programs should be allocated to the processor or processors. Random-access memory Random-access memory is used to both program instructions and data. Typically, both need to be present in memory in order for a program to execute, often multiple programs will want access to memory, frequently demanding more memory than the computer has available. The kernel is responsible for deciding which memory each process can use, input/output devices I/O devices include such peripherals as keyboards, mice, disk drives, printers, network adapters, and display devices. The kernel allocates requests from applications to perform I/O to an appropriate device, key aspects necessary in resource management are the definition of an execution domain and the protection mechanism used to mediate the accesses to the resources within a domain. Kernels also usually provide methods for synchronization and communication between processes called inter-process communication, finally, a kernel must provide running programs with a method to make requests to access these facilities. The kernel has full access to the memory and must allow processes to safely access this memory as they require it. Often the first step in doing this is virtual addressing, usually achieved by paging and/or segmentation, virtual addressing allows the kernel to make a given physical address appear to be another address, the virtual address. This allows every program to behave as if it is the one running
11.
Monolithic kernel
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A monolithic kernel is an operating system architecture where the entire operating system is working in kernel space and is alone in supervisor mode. The monolithic model differs from other operating system architectures in that it defines a high-level virtual interface over computer hardware. A set of primitives or system calls implement all operating system such as process management, concurrency. Device drivers can be added to the kernel as modules and this modularity of the operating system is at the binary level and not at the architecture level. Modular monolithic operating systems are not to be confused with the level of modularity inherent in Server-Client operating systems which use microkernels. Practically speaking, dynamically loading modules is simply a more flexible way of handling the operating system image at runtime — as opposed to rebooting with a different operating system image, the modules allow easy extension of the operating systems capabilities as required. Dynamically loadable modules incur a small overhead when compared to building the module into the system image. Namely, an unloaded module need not be stored in random access memory
12.
User interface
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The user interface, in the industrial design field of human–computer interaction, is the space where interactions between humans and machines occur. Examples of this concept of user interfaces include the interactive aspects of computer operating systems, hand tools, heavy machinery operator controls. The design considerations applicable when creating user interfaces are related to or involve such disciplines as ergonomics and psychology. Generally, the goal of user interface design is to produce a user interface makes it easy, efficient. This generally means that the needs to provide minimal input to achieve the desired output. Other terms for user interface are man–machine interface and when the machine in question is a computer human–computer interface, the user interface or human–machine interface is the part of the machine that handles the human–machine interaction. Membrane switches, rubber keypads and touchscreens are examples of the part of the Human Machine Interface which we can see. In complex systems, the interface is typically computerized. The term human–computer interface refers to this kind of system, in the context of computing the term typically extends as well to the software dedicated to control the physical elements used for human-computer interaction. The engineering of the interfaces is enhanced by considering ergonomics. The corresponding disciplines are human factors engineering and usability engineering, which is part of systems engineering, tools used for incorporating human factors in the interface design are developed based on knowledge of computer science, such as computer graphics, operating systems, programming languages. Nowadays, we use the graphical user interface for human–machine interface on computers. There is a difference between a user interface and an interface or a human–machine interface. A human-machine interface is typically local to one machine or piece of equipment, an operator interface is the interface method by which multiple equipment that are linked by a host control system is accessed or controlled. The system may expose several user interfaces to serve different kinds of users, for example, a computerized library database might provide two user interfaces, one for library patrons and the other for library personnel. The user interface of a system, a vehicle or an industrial installation is sometimes referred to as the human–machine interface. HMI is a modification of the original term MMI, in practice, the abbreviation MMI is still frequently used although some may claim that MMI stands for something different now. Another abbreviation is HCI, but is commonly used for human–computer interaction
13.
Command-line interface
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A program which handles the interface is called a command language interpreter or shell. The interface is implemented with a command line shell, which is a program that accepts commands as text input. Command-line interfaces to computer operating systems are widely used by casual computer users. Alternatives to the line include, but are not limited to text user interface menus, keyboard shortcuts. Examples of this include the Windows versions 1,2,3,3.1, and 3.11, DosShell, and Mouse Systems PowerPanel. Command-line interfaces are preferred by more advanced computer users, as they often provide a more concise. Programs with command-line interfaces are generally easier to automate via scripting, a program that implements such a text interface is often called a command-line interpreter, command processor or shell. Under most operating systems, it is possible to replace the shell program with alternatives, examples include 4DOS for DOS, 4OS2 for OS/2. For example, the default Windows GUI is a program named EXPLORER. EXE. These programs are shells, but not CLIs, application programs may also have command line interfaces. When a program is launched from an OS command line shell, interactive command line sessions, After launch, a program may provide an operator with an independent means to enter commands in the form of text. OS inter-process communication, Most operating systems support means of inter-process communication, Command lines from client processes may be redirected to a CLI program by one of these methods. Some applications support only a CLI, presenting a CLI prompt to the user, Some examples of CLI-only applications are, DEBUG Diskpart Ed Edlin Fdisk Ping Some computer programs support both a CLI and a GUI. In some cases, a GUI is simply a wrapper around a separate CLI executable file, in other cases, a program may provide a CLI as an optional alternative to its GUI. CLIs and GUIs often support different functionality, for example, all features of MATLAB, a numerical analysis computer program, are available via the CLI, whereas the MATLAB GUI exposes only a subset of features. The early Sierra games, like the first three Kings Quest games, used commands from a command line to move the character around in the graphic window. Early computer systems often used teleprinter machines as the means of interaction with a human operator, the computer became one end of the human-to-human teleprinter model. So instead of a human communicating with another human over a teleprinter, in time, the actual mechanical teleprinter was replaced by a glass tty, and then by a smart terminal
14.
Software license
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A software license is a legal instrument governing the use or redistribution of software. Under United States copyright law all software is copyright protected, in code as also object code form. The only exception is software in the public domain, most distributed software can be categorized according to its license type. Two common categories for software under copyright law, and therefore with licenses which grant the licensee specific rights, are proprietary software and free, unlicensed software outside the copyright protection is either public domain software or software which is non-distributed, non-licensed and handled as internal business trade secret. Contrary to popular belief, distributed unlicensed software is copyright protected. Examples for this are unauthorized software leaks or software projects which are placed on public software repositories like GitHub without specified license. As voluntarily handing software into the domain is problematic in some international law domains, there are also licenses granting PD-like rights. Therefore, the owner of a copy of software is legally entitled to use that copy of software. Hence, if the end-user of software is the owner of the respective copy, as many proprietary licenses only enumerate the rights that the user already has under 17 U. S. C. §117, and yet proclaim to take away from the user. Proprietary software licenses often proclaim to give software publishers more control over the way their software is used by keeping ownership of each copy of software with the software publisher. The form of the relationship if it is a lease or a purchase, for example UMG v. Augusto or Vernor v. Autodesk. The ownership of goods, like software applications and video games, is challenged by licensed. The Swiss based company UsedSoft innovated the resale of business software and this feature of proprietary software licenses means that certain rights regarding the software are reserved by the software publisher. Therefore, it is typical of EULAs to include terms which define the uses of the software, the most significant effect of this form of licensing is that, if ownership of the software remains with the software publisher, then the end-user must accept the software license. In other words, without acceptance of the license, the end-user may not use the software at all, one example of such a proprietary software license is the license for Microsoft Windows. The most common licensing models are per single user or per user in the appropriate volume discount level, Licensing per concurrent/floating user also occurs, where all users in a network have access to the program, but only a specific number at the same time. Another license model is licensing per dongle which allows the owner of the dongle to use the program on any computer, Licensing per server, CPU or points, regardless the number of users, is common practice as well as site or company licenses
15.
IBM Personal Computer
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The IBM Personal Computer, commonly known as the IBM PC, is the original version and progenitor of the IBM PC compatible hardware platform. It is IBM model number 5150, and was introduced on August 12,1981 and it was created by a team of engineers and designers under the direction of Don Estridge of the IBM Entry Systems Division in Boca Raton, Florida. IBM compatible became an important criterion for sales growth, only the Apple Macintosh family kept significant market share without compatibility with the IBM personal computer, International Business Machines, one of the worlds largest companies, had a 62% share of the mainframe computer market in 1981. Its share of the computer market, however, had declined from 60% in 1970 to 32% in 1980. In 1979 BusinessWeek asked, Is IBM just another stodgy, mature company, by 1981 its stock price had declined by 22%. IBMs earnings for the first half the year grew by 5. 3%—one third of the inflation rate—while those of minicomputer maker Digital Equipment Corporation grew by more than 35%. B. M, No longer dominates the computer business. IBM wished to avoid the outcome with the new personal computer industry, dominated by the Commodore PET, Atari 8-bit family, Apple II, Tandy Corporations TRS-80. With $150 million in sales by 1979 and projected growth of more than 40% in the early 1980s. The Japanese project, codenamed Go, ended before the 1981 release of the American-designed IBM PC codenamed Chess, whether IBM had waited too long to enter an industry in which Apple and others were already successful was unclear. An observer stated that IBM bringing out a computer would be like teaching an elephant to tap dance. Successful microcomputer company Vector Graphics fiscal 1980 revenue was $12 million, the company only sold through its internal sales force, had no experience with resellers or retail stores, and did not introduce the first product designed to work with non-IBM equipment until 1980. Another observer claimed that IBM made decisions so slowly that, when tested, as with other large computer companies, its new products typically required about four to five years for development. IBM had to learn how to develop, mass-produce. The potential importance to microcomputers of a company so prestigious, that a saying in American companies stated No one ever got fired for buying IBM, was nonetheless clear. InfoWorld, which described itself as The Newsweekly for Microcomputer Users, stated that for my grandmother, is far and away the media star, not because of its features, but because it exists at all. When the number eight company in the Fortune 500 enters the field, the influence of a personal computer made by a company whose name has literally come to mean computer to most of the world is hard to contemplate. The editorial acknowledged that some factions in our industry have looked upon IBM as the enemy, desktop sized programmable calculators by Hewlett Packard had evolved into the HP9830 BASIC language computer by 1972. In 1972–1973 a team led by Dr. SCAMP emulated an IBM1130 minicomputer to run APL\1130, in 1973 APL was generally available only on mainframe computers, and most desktop sized microcomputers such as the Wang 2200 or HP9800 offered only BASIC
16.
MS-DOS
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MS-DOS is a discontinued operating system for x86-based personal computers mostly developed by Microsoft. MS-DOS resulted from a request in 1981 by IBM for a system to use in its IBM PC range of personal computers. Microsoft quickly bought the rights to 86-DOS from Seattle Computer Products, IBM licensed and released it in August 1981 as PC DOS1.0 for use in their PCs. During its life, several competing products were released for the x86 platform and it was also the underlying basic operating system on which early versions of Windows ran as a GUI. It is a operating system, and consumes negligible installation space. MS-DOS was a form of 86-DOS – owned by Seattle Computer Products. This first version was shipped in August 1980, Microsoft, which needed an operating system for the IBM Personal Computer hired Tim Paterson in May 1981 and bought 86-DOS1.10 for $75,000 in July of the same year. Microsoft kept the number, but renamed it MS-DOS. They also licensed MS-DOS1. 10/1.14 to IBM, within a year Microsoft licensed MS-DOS to over 70 other companies. It was designed to be an OS that could run on any 8086-family computer, thus, there were many different versions of MS-DOS for different hardware, and there is a major distinction between an IBM-compatible machine and an MS-DOS machine. This design would have worked well for compatibility, if application programs had only used MS-DOS services to perform device I/O, Microsoft omitted multi-user support from MS-DOS because Microsofts Unix-based operating system, Xenix, was fully multi-user. After the breakup of the Bell System, however, AT&T Computer Systems started selling UNIX System V, believing that it could not compete with AT&T in the Unix market, Microsoft abandoned Xenix, and in 1987 transferred ownership of Xenix to the Santa Cruz Operation. On 25 March 2014, Microsoft made the code to SCP MS-DOS1.25, as an April Fools joke in 2015, Microsoft Mobile launched a Windows Phone application called MS-DOS Mobile which was presented as a new mobile operating system and worked similar to MS-DOS. Version 3.1 – Support for Microsoft Networks Version 3.2 – First version to support 3.5 inch,720 kB floppy drives and diskettes. Version 3.21 Version 3.22 – Version 3.25 Version 3.3 – First version to support 3.5 inch,1.44 MB floppy drives and diskettes, Version 3. 3a Version 3.31 – supports FAT16B and larger drives. MS-DOS4.0 and MS-DOS4.1 – A separate branch of development with additional multitasking features and it is unrelated to any later versions, including versions 4.00 and 4.01 listed below MS-DOS4. x – includes a graphical/mouse interface. It had many bugs and compatibility issues. Version 4.00 – First version to support a hard disk partition that is greater than 32 MiB. Version 4.01 – Microsoft rewritten Version 4.00 released under MS-DOS label, First version to introduce volume serial number when formatting hard disks and floppy disks
17.
Bill Gates
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William Henry Bill Gates III is an American business magnate, investor, author, and philanthropist. In 1975, Gates and Paul Allen co-founded Microsoft, which became the worlds largest PC software company, during his career at Microsoft, Gates held the positions of chairman, CEO and chief software architect, and was the largest individual shareholder until May 2014. Gates has authored and co-authored several books, since 1987, Gates has been included in the Forbes list of the worlds wealthiest people and was the wealthiest from 1995 to 2007, again in 2009, and has been since 2014. Between 2009 and 2014, his wealth doubled from US$40 billion to more than US$82 billion, between 2013 and 2014, his wealth increased by US$15 billion. Gates is currently the richest person in the world, with a net worth of US$85.6 billion as of February 2017. Gates is one of the entrepreneurs of the personal computer revolution. He has been criticized for his business tactics, which have been considered anti-competitive, Gates stepped down as chief executive officer of Microsoft in January 2000. He remained as chairman and created the position of chief architect for himself. In June 2006, Gates announced that he would be transitioning from full-time work at Microsoft to part-time work and he gradually transferred his duties to Ray Ozzie and Craig Mundie. He stepped down as chairman of Microsoft in February 2014, taking on a new post as adviser to support the then newly appointed CEO Satya Nadella. Gates was born in Seattle, Washington on October 28,1955 and he is the son of William H. Gates Sr. and Mary Maxwell Gates. His ancestry includes English, German, Irish, and Scots-Irish and his father was a prominent lawyer, and his mother served on the board of directors for First Interstate BancSystem and the United Way. Gates maternal grandfather was JW Maxwell, a bank president. Gates has one sister, Kristi, and one younger sister. He is the fourth of his name in his family, but is known as William Gates III or Trey because his father had the II suffix, early on in his life, Gates parents had a law career in mind for him. When Gates was young, his family attended a church of the Congregational Christian Churches. The family encouraged competition, one reported that it didnt matter whether it was hearts or pickleball or swimming to the dock. There was always a reward for winning and there was always a penalty for losing, at 13, he enrolled in the Lakeside School, a private preparatory school
18.
UCSD Pascal
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UCSD Pascal was a Pascal programming language system that ran on the UCSD p-System, a portable, highly machine-independent operating system. UCSD Pascal was first released in 1978 and it was developed at the University of California, San Diego. The operating system known as UCSD p-System. UCSD p-System was one of three operating systems, along with PC DOS and CP/M-86, that IBM offered for its original IBM PC, vendor SofTech Microsystems emphasized p-Systems application portability, with virtual machines for 20 CPUs as of the IBM PCs release. It predicted that users would be able to use applications they purchased on future computers running p-System, PC Magazine denounced UCSD p-System on the IBM PC, stating in a review of Context MBA, written in the language, that it simply does not produce good code. The p-System did not sell well for the IBM PC, because of a lack of applications. Previously, IBM had offered the UCSD p-System as an option for Displaywriter, notable extensions to standard Pascal include separately compilable Units and a String type. Both of these influenced the design of the Ada language. Some intrinsics were provided to accelerate string processing, other extensions were provided to allow the UCSD p-System to be self-compiling. UCSD Pascal was based on a p-code machine architecture and its contribution to these early virtual machines was to extend p-code away from its roots as a compiler intermediate language into a full execution environment. The UCSD Pascal p-Machine was optimized for the new small microcomputers with addressing restricted to 16-bit, james Gosling cites UCSD Pascal as a key influence on the design of the Java virtual machine. UCSD p-System achieved machine independence by defining a virtual machine, called the p-Machine with its own instruction set called p-code. Urs Ammann, a student of Niklaus Wirth, originally presented a p-code in his PhD thesis, from which the UCSD implementation was derived, the UCSD implementation changed the Zurich implementation to be byte oriented. The UCSD p-code was optimized for execution of the Pascal programming language, each hardware platform then only needed a p-code interpreter program written for it to port the entire p-System and all the tools to run on it. Later versions also included additional languages that compiled to the p-code base, for example, Apple Computer offered a Fortran Compiler producing p-code that ran on the Apple version of the p-system. UCSD p-System shares some concepts with the more current Java platform, both use a virtual machine to hide operating system and hardware differences, and both use programs written to that virtual machine to provide cross-platform support. Likewise both systems allow the machine to be used either as the complete operating system of the target computer or to run in a box under another operating system. The UCSD Pascal compiler was distributed as part of a operating system
19.
86-DOS
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86-DOS is a discontinued operating system developed and marketed by Seattle Computer Products for its Intel 8086-based computer kit. Initially known as QDOS the name was changed to 86-DOS once SCP started licensing the operating system in 1980, 86-DOS had a command structure and application programming interface that imitated that of Digital Researchs CP/M operating system, which made it easy to port programs from the latter. The system was purchased by Microsoft and developed further as MS-DOS, 86-DOS was created because sales of the Seattle Computer Products 8086 computer kit, demonstrated in June 1979 and shipped in November, were languishing due to the absence of an operating system. The only software which SCP could sell with the board was Microsofts Standalone Disk BASIC-86, SCP wanted to offer the 8086-version of CP/M that Digital Research had announced, but its release date was uncertain. This was not the first time Digital Research had lagged behind hardware developments, in April 1980 SCP assigned 24-year-old Tim Paterson to develop a substitute for CP/M-86. At the same time he made a number of changes and enhancements to address what he saw as CP/Ms shortcomings. CP/M cached file system information in memory for speed, but this required a user to force an update to a disk before removing it, if the user forgot, Paterson took the safer but slower approach of updating the disk with each operation. CP/Ms PIP command, which copied files, supported several special file names that referred to hardware such as printers. Paterson built these names into the system as device files so that any program could use them. He gave his copying program the more intuitive name COPY, rather than implementing CP/Ms file system, he drew on Microsoft Standalone Disk BASIC-86s FAT filesystem. By mid-1980 SCP advertised 86-DOS, priced at $95 for owners of its $12908086 board, in October 1980, IBM was developing what would become the original IBM Personal Computer. CP/M was by far the most popular operating system in use at the time, IBMs representatives visited Digital Research and discussed licensing with Digital Researchs licensing representative, Dorothy Kildall, who hesitated to sign IBMs non-disclosure agreement. Although the NDA was later accepted, Digital Research would not accept IBMs proposal of $250,000 in exchange for as many copies as IBM could sell, insisting on the usual royalty-based plan. In later discussions between IBM and Bill Gates, Gates mentioned the existence of 86-DOS and IBM representative Jack Sams told him to get a license for it, Microsoft purchased a non-exclusive license for 86-DOS from Seattle Computer Products in December 1980 for $25,000. In May 1981, it hired Tim Paterson to port the system to the IBM PC, IBM watched the developments daily, submitted over 300 change requests before it accepted the product and wrote the user manual for it. In July 1981, a month before the PCs release, Microsoft purchased all rights to 86-DOS from SCP for $50,000, Microsoft licensed 86-DOS to IBM, and it became PC DOS1.0. This license also permitted Microsoft to sell DOS to other companies, the deal was spectacularly successful, and SCP later claimed in court that Microsoft had concealed its relationship with IBM in order to purchase the operating system cheaply. SCP ultimately received a 1 million dollar settlement payment, when Digital Research founder Gary Kildall examined PC DOS and found that it duplicated CP/Ms programming interface, he wanted to sue IBM, which at the time claimed that PC DOS was its own product
20.
Seattle Computer Products
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Seattle Computer Products was a Seattle, Washington microcomputer hardware company which was one of the first manufacturers of computer systems based on the 16-bit Intel 8086 processor. SCP shipped an operating system for that hardware about a year before the release of the PC, SCP was staffed partly by high-school students from nearby communities who soldered and assembled the computers. Some of them would work for Microsoft. Twenty-two-year-old Tim Paterson was hired in June 1978 by SCPs owner Rod Brock, Paterson had a prototype working by May 1979, and he took his computer over to Microsoft, who were working on an 8086 BASIC, which was working before the end of May. When the board began shipping in November, standalone Microsoft BASIC was offered as an option, digital Research, whose 8-bit CP/M operating system was the industry standard, was working on an 8086-compatible version called CP/M-86, but the delay in its release was costing SCP sales. In order to fill this void, Paterson wrote QDOS over a period starting in April 1980. QDOS0.11 was finished in August 1980, and SCP began shipping it in September 1980, the operating system was renamed to 86-DOS in December 1980. Realizing that Microsoft was making significant profit on the 86-DOS operating system, thanks to the deal with Microsoft, additional capital allowed Seattle Computer to expand its memory business into providing additional memory for PC products. The company had its best year in 1982, reaping more than a million dollars in profit on about $4 million in sales, by 1985, however, SCPs business was having difficulty trying to compete with offshore products, and Brock decided to sell the company. The only major asset SCP had left was the license it received from Microsoft when it signed over rights to 86-DOS. Brock planned to sell the license to the highest bidder, with a such as the Tandy Corporation in mind. After Microsoft objected to Brocks exaggerated interpretation of the agreement and informed Brock that his license was nontransferable, the ensuing lawsuit was highly technical and grew to fill hundreds of pages in the months leading up to trial. The trial began at the end of 1986 and lasted three weeks, an out-of-court settlement was reached while the jury was deliberating. Microsoft paid SCP $925,000 and reclaimed its license for DOS SCP went out of business in the late 80s as the market for Intel 8086 systems became dominated by PC compatible computers
21.
Floppy disk
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Floppy disks are read and written by a floppy disk drive. Floppy disks, initially as 8-inch media and later in 5¼-inch and 3½-inch sizes, were a form of data storage and exchange from the mid-1970s into the mid-2000s. These formats are usually handled by older equipment and these disks and associated drives were produced and improved upon by IBM and other companies such as Memorex, Shugart Associates, and Burroughs Corporation. The term floppy disk appeared in print as early as 1970, in 1976, Shugart Associates introduced the first 5¼-inch FDD. By 1978 there were more than 10 manufacturers producing such FDDs, there were competing floppy disk formats, with hard- and soft-sector versions and encoding schemes such as FM, MFM and GCR. The 5¼-inch format displaced the 8-inch one for most applications, the most common capacity of the 5¼-inch format in DOS-based PCs was 360 kB and in 1984 IBM introduced the 1.2 MB dual-sided floppy disk along with its PC-AT model. IBM started using the 720 kB double-density 3½-inch microfloppy disk on its Convertible laptop computer in 1986 and these disk drives could be added to older PC models. In 1988 IBM introduced a drive for 2.88 MB DSED diskettes in its top-of-the-line PS/2 models, throughout the early 1980s, limitations of the 5¼-inch format became clear. Originally designed to be practical than the 8-inch format, it was itself too large, as the quality of recording media grew. A number of solutions were developed, with drives at 2-, 2½-, 3-, 3½-, the large market share of the 5¼-inch format made it difficult for these new formats to gain significant market share. A variant on the Sony design, introduced in 1982 by a number of manufacturers, was then rapidly adopted. By the end of the 1980s, 5¼-inch disks had been superseded by 3½-inch disks, by the mid-1990s, 5¼-inch drives had virtually disappeared, as the 3½-inch disk became the predominant floppy disk. Floppy disks became ubiquitous during the 1980s and 1990s in their use with computers to distribute software, transfer data. Before hard disks became affordable to the population, floppy disks were often used to store a computers operating system. Most home computers from that period have a primary OS and BASIC stored as ROM, by the early 1990s, the increasing software size meant large packages like Windows or Adobe Photoshop required a dozen disks or more. In 1996, there were a five billion standard floppy disks in use. Then, distribution of packages was gradually replaced by CD-ROMs, DVDs. External USB-based floppy disk drives are available, many modern systems provide firmware support for booting from such drives
22.
BIOS
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The BIOS is a type of firmware used to perform hardware initialization during the booting process on IBM PC compatible computers, and to provide runtime services for operating systems and programs. The BIOS firmware is built into personal computers, and it is the first software they run when powered on, the name itself originates from the Basic Input/Output System used in the CP/M operating system in 1975. Originally proprietary to the IBM PC, the BIOS has been engineered by companies looking to create compatible systems. The fundamental purposes of the BIOS in modern PCs are to initialize and test the hardware components. Variations in the hardware are hidden by the BIOS from programs that use BIOS services instead of directly accessing the hardware. MS-DOS, which was the dominant PC operating system from the early 1980s until the mid-1990s, relied on BIOS services for disk, keyboard, and text display functions. Most BIOS implementations are specifically designed to work with a computer or motherboard model. This allows easy updates to the BIOS firmware so new features can be added or bugs can be fixed, unified Extensible Firmware Interface was designed as a successor to BIOS, aiming to address its technical shortcomings. As of 2014, new PC hardware predominantly ships with UEFI firmware, together with the underlying hardware-specific, but operating system-independent System BIOS, which resides in ROM, it represents the analogous to the CP/M BIOS. With the introduction of PS/2 machines, IBM divided the System BIOS into real-mode, the BIOS of the original IBM PC XT had no interactive user interface. Options on the IBM PC and XT were set by switches and jumpers on the main board, starting around the mid-1990s, it became typical for the BIOS ROM to include a BIOS configuration utility or BIOS setup utility, accessed at system power-up by a particular key sequence. This program allowed the user to set configuration options, of the type formerly set using DIP switches. The disk was supplied with the computer, and if it was lost the settings could not be changed. Instead of battery-backed RAM, the modern Wintel machine may store the BIOS configuration settings in flash ROM, early Intel processors started at physical address 000FFFF0h. When a modern x86 microprocessor is reset, it starts in pseudo 16-bit real mode, the code segment register is initialized with selector F000h, base FFFF0000h, and limit FFFFh, so that execution starts at 4 GB minus 16 bytes. The platform logic maps this address into the system ROM, mirroring address 000FFFF0h, if the system has just been powered up or the reset button was pressed, the full power-on self-test is run. This saves the time used to detect and test all memory. If the download was apparently successful, the BIOS would verify a checksum on it and then run it
23.
Boca Raton, Florida
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Boca Raton is the southernmost city in Palm Beach County, Florida, United States, first incorporated on August 2,1924 as Bocaratone, and then incorporated as Boca Raton in 1925. The 2015 population estimated by the U. S. Census Bureau was 93,235, however, approximately 200,000 people with a Boca Raton postal address reside outside its municipal boundaries. Such areas include newer developments like West Boca Raton, as a business center, the city also experiences significant daytime population increases. It is one of the wealthiest communities in South Florida, Boca Raton is located 43 miles north of Miami and is a principal city of the Miami metropolitan area, which was home to an estimated 6,012,331 people at the 2015 census. Boca Raton is home to the campus of Florida Atlantic University and the corporate headquarters of Office Depot, ADT. It is also home to the Evert Tennis Academy, owned by tennis player Chris Evert. Town Center Mall, a shopping center in West Boca Raton, is the largest indoor mall in Palm Beach County. Another major attraction to the area is Boca Ratons downtown, known as Mizner Park, still today, Boca Raton has a strict development code for the size and types of commercial buildings, building signs, and advertisements that may be erected within the city limits. No outdoor car dealerships are allowed in the municipality, additionally, no billboards are permitted, the citys only billboard was grandfathered in during annexation. The strict development code has led to major thoroughfares without large signs or advertisements in the travelers view. The original name Boca de Ratones appeared on eighteenth-century maps associated with an inlet in the Biscayne Bay area of Miami. The word ratones appears in old Spanish maritime dictionaries referring to rugged rocks or stony ground on the bottom of some ports and coastal outlets, therefore, the abridged translation defining Boca de Ratones is a shallow inlet of sharp-pointed rocks which scrape a ships cables. Residents of the city have kept the pronunciation of Boca Raton similar to its Spanish origins, in particular, the Raton in Boca Raton is pronounced as /rəˈtoʊn/ instead of /rəˈtɑːn/. The latter is a common mispronunciation by non-natives to the region, the area today known as Boca Raton was originally occupied by the Tequesta tribe, a Native American people that occupied an area along the southeastern Atlantic coast of Florida. What Spanish voyagers called Boca de Ratones was originally located to the south, by mistake since the 19th century, mapmakers moved this location to the north and began referring to the citys lake, today known as Lake Boca Raton, as Boca Ratone Sounde. The area was largely uninhabited after the Indigenous people were cleared from the area by the Spanish and he surveyed and sold land from the canal to beyond the railroad north of what is now Palmetto Park Road. Early settlement in the area increased shortly after Henry Flaglers expansion of the Florida East Coast Railway, in the citys early history during the Florida land boom of the 1920s, several investors were interested in turning Boca Raton into a resort town. Most famously, Addison Mizner had several projects for resorts and mansions in the area and he first constructed his Administrative Buildings and a small hotel to house interested investors
24.
Byte (magazine)
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Byte magazine was an American microcomputer magazine, influential in the late 1970s and throughout the 1980s because of its wide-ranging editorial coverage. Coverage was in-depth with much detail, rather than user-oriented. Print publication ceased in 1998 and online publication in 2013, Byte started in 1975, shortly after the first personal computers appeared as kits advertised in the back of electronics magazines. Byte was published monthly, with a yearly subscription price of $10. In 1975 Wayne Green was the editor and publisher of 73 and his ex-wife, on May 25th we made a deal with the publisher of a small computer hobby magazine to take over as editor of a new publication which would start in August. Carl Helmers published a series of six articles in 1974 that detailed the design and construction of his Experimenters Computer System, in January 1975 this became the monthly ECS magazine with 400 subscribers. The last issue was published on May 12,1975 and in June the subscribers were mailed a notice announcing Byte magazine, carl wrote to another hobbyist newsletter, Micro-8 Computer User Group Newsletter, and described his new job as editor of Byte magazine. I got a note in the mail about two weeks ago from Wayne Green, publisher of 73 Magazine essentially saying hello and why dont you come up, the net result of a follow up is the decision to create BYTE magazine using the facilities of Green Publishing Inc. I will end up with the focus for the magazine. Virginia Londner Green had returned to 73 in the December 1974 issue, the first five issues of Byte were published by Green Publishing and the name was changed to Byte Publications starting with the February 1976 issue. Carl Helmers was a co-owner of Byte Publications, the first four issues were produced in the offices of 73 and Wayne Green was listed as the publisher. One day in November 1975 Wayne came to work and found that the Byte magazine staff had moved out, the February 1976 issue of Byte has a short story about the move. After a start which reads like a light opera with an episode or two reminiscent of the Keystone Cops, Byte magazine finally has moved into separate offices of its own. Wayne Green was not happy about losing Byte magazine so he was going to start a new one called Kilobyte, Byte quickly trademarked KILOBYTE as a cartoon series in Byte magazine. The new magazine was called Kilobaud, there was competition and animosity between Byte Publications and 73 Inc. but both remained in the small town of Peterborough, New Hampshire. Byte was able to attract advertising and articles from many well-knowns, soon-to-be-well-knowns, articles in the first issue included Which Microprocessor For You. by Hal Chamberlin, Write Your Own Assembler by Dan Fylstra and Serial Interface by Don Lancaster. Advertisements from Godbout, MITS, Processor Technology, SCELBI, and Sphere appear, early articles in Byte were do-it-yourself electronic or software projects to improve small computers. A continuing feature was Ciarcias Circuit Cellar, a column in which electronic engineer Steve Ciarcia described small projects to modify or attach to a computer, Byte ran Microsofts first advertisement, as Micro-Soft, to sell a BASIC interpreter for 8080-based computers
25.
Rebranding
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Often, this involves radical changes to a brands logo, name, legal names, image, marketing strategy, and advertising themes. Rebranding can be applied to new products, mature products, or even products still in development, rebranding can also refer to a change in a company/ corporate brand that may own several sub-brands for products or companies. Rebranding has become something of a fad at the turn of the millennium, the rebranding of Philip Morris to Altria was done to help the company shed its negative image. Other rebrandings, such as the British Post Offices attempt to itself as Consignia, have proved such a failure that millions more had to be spent going back to square one. According to Sinclair, business the world over acknowledges the value of brands. “Brands, it seems, alongside ownership of copyright and trademarks, computer software and specialist know-how, are now at the heart of the intangible value investors place on companies. ”As such, companies in the 21st century may find it necessary to relook their brand in terms of its relevancy to consumers and the changing marketplace. Successful rebranding projects can yield a better off than before. Due to the impact that renaming and rebranding a company can have, it is critical to take the client through the process with great sensitivity. The new company identity and brand should also be launched in a subtle and methodical manner in order to avoid alienating old customers, marketing develops the awareness and associations in consumer memory so that customers know which brands best serve their needs. Corporations often rebrand in order to respond to external and/or internal issues, firms commonly have rebranding cycles in order to stay current with the times or set themselves ahead of the competition. Companies also utilize rebranding as a marketing tool to hide malpractices of the past. Corporations such as Citigroup, AOL, American Express, and Goldman Sachs all utilize third-party vendors that specialize in brand strategy, companies invest valuable resources into rebranding and third-party vendors because it is a way to protect them from being blackballed by customers in a very competitive market. Dr. Roger Sinclair, an expert on brand valuation and brand equity practice worldwide stated, “A brand is a resource acquired by an enterprise that generates future economic benefits. ”Once a brand has negative connotations associated with it, it can only lead to decreased profitability. Companies differentiate themselves from competitors by incorporating practices from changing their logo to going green, differentiating from competitors is important in order to attract more customers and an effective way to draw in more desirable employees. The need to differentiate is especially prevalent in saturated markets such as the services industry. Organisations may rebrand intentionally to shed negative images of the past, research suggests that concern over external perceptions of the organisation and its activities can function as a major driver in rebranding exercises. In a corporate context, managers can utilize rebranding as a marketing strategy to hide malpractices and avoid or shed negative connotations. Corporations such as Philip Morris USA, Blackwater and AIG rebranded in order to shed negative images, in 2008, AIGs image became damaged due to its need for a Federal bailout during the financial crisis
26.
CP/M
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Initially confined to single-tasking on 8-bit processors and no more than 64 kilobytes of memory, later versions of CP/M added multi-user variations and were migrated to 16-bit processors. The combination of CP/M and S-100 bus computers was loosely patterned on the MITS Altair and this computer platform was widely used in business through the late 1970s and into the mid-1980s. CP/M increased the size for both hardware and software by greatly reducing the amount of programming required to install an application on a new manufacturers computer. An important driver of innovation was the advent of low-cost microcomputers running CP/M, as independent programmers and hackers bought them. CP/M was displaced by MS-DOS soon after the 1981 introduction of the IBM PC, manufacturers of CP/M-compatible systems customized portions of the operating system for their own combination of installed memory, disk drives, and console devices. CP/M would also run on based on the Zilog Z80 processor since the Z80 was compatible with 8080 code. CP/M used the 7-bit ASCII set, the other 128 characters made possible by the 8-bit byte were not standardized. For example, one Kaypro used them for Greek characters, WordStar used the 8th bit as an end-of-word marker. The BIOS and BDOS were memory-resident, while the CCP was memory-resident unless overwritten by an application, a number of transient commands for standard utilities were also provided. The transient commands resided in files with the extension. COM on disk, the BIOS directly controlled hardware components other than the CPU and main memory. It contained functions such as input and output and the reading and writing of disk sectors. The BDOS implemented the CP/M file system and some input/output abstractions on top of the BIOS, the CCP took user commands and either executed them directly or loaded and started an executable file of the given name. Third-party applications for CP/M were also essentially transient commands, the BDOS, CCP and standard transient commands were the same in all installations of a particular revision of CP/M, but the BIOS portion was always adapted to the particular hardware. Adding memory to a computer, for example, meant that the CP/M system had to be reinstalled with an updated BIOS capable of addressing the additional memory, a utility was provided to patch the supplied BIOS, BDOS and CCP to allow them to be run from higher memory. Once installed, the system was stored in reserved areas at the beginning of any disk which would be used to boot the system. On start-up, the bootloader would load the system from the disk in drive A. By modern standards CP/M was primitive, owing to the constraints on program size. With version 1.0 there was no provision for detecting a changed disk, if a user changed disks without manually rereading the disk directory the system would write on the new disk using the old disks directory information, ruining the data stored on the disk
27.
Paul Allen
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Paul Gardner Allen is an American business magnate, investor and philanthropist. He is best known as the co-founder of Microsoft, alongside Bill Gates, as of August 2016, he was estimated to be the 40th richest person in the world, with an estimated net worth of $18.6 billion. Allen is the founder and Chairman of Vulcan Inc. which manages his various business, Allen also has a multibillion-dollar investment portfolio including technology and media companies, real estate holdings, and stakes in other companies. He owns two sports teams, the Seattle Seahawks of the National Football League and the Portland Trail Blazers of the National Basketball Association. He is also part-owner of the Seattle Sounders FC, which joined Major League Soccer in 2009 and he is also the founder of Allen Institute for Brain Science, Institute for Artificial Intelligence, Institute for Cell Science, and Vulcan Aerospace. Paul Allen was born on January 21,1953 in Seattle, Washington to Kenneth Sam Allen, Allen attended Lakeside School, a private school in Seattle, where he befriended Bill Gates, three years younger, with whom he shared an enthusiasm for computers. They used Lakesides Teletype terminal to develop their skills on several time-sharing computer systems. Allen later convinced Gates to drop out of Harvard University in order to create Microsoft, Gates explained his official status with Harvard that. if things hadnt worked out, I could always go back to school. In Albuquerque, New Mexico, Paul Allen with his friend Bill Gates, in 1975, Allen came up with the original name of Micro-Soft, as recounted in a 1995 Fortune magazine article. As a result of this transaction, Microsoft was able to secure a contract to supply the DOS that would run on IBMs PC line. This contract with IBM was the watershed in Microsoft history that led to Allens and Gates wealth, Allen effectively left Microsoft in 1982 due to serious illness. Vulcan Capital is an investment-arm of Allens Seattle-based Vulcan Inc. which manages his personal fortune, in 2013, Allen opened a new Vulcan Capital office in Palo Alto, California to focus on making new investments in emerging technology and internet companies. Recent investments include Redfin, Decide. com and Audience Inc, patents, Paul Allen holds 43 patents from the United States Patent and Trademark Office. The startup behind the mobile app Saga, SportStream, an app for sports fans. Ticketmaster, In 1993, Paul Allen invested $243 million to acquire 80% of Ticketmaster, in 1997, Home Shopping Network acquired 47. 5% of Allens stock in exchange for $209 million worth of their own stock. Allen confirmed that he was the investor behind Burt Rutans Scaled Composites SpaceShipOne suborbital commercial spacecraft on October 4,2004. SpaceShipOne climbed to an altitude of 377,591 feet and was the first privately funded effort to put a civilian in suborbital space. It won the Ansari X Prize competition and received the $10 million prize, on December 13,2011, Allen announced the creation of Stratolaunch Systems
28.
IBM Personal Computer XT
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The IBM Personal Computer XT, often shortened to the IBM XT, PC XT, or simply XT, is a version of the IBM PC with a built-in hard drive. It was released as IBM Machine Type number 5160 on March 8,1983, apart from the hard drive, it was essentially the same as the original PC, with only minor improvements. The XT was mainly intended as an enhanced IBM PC for business users, later floppy-only models would effectively replace the original model 5150 PC. A corresponding 3270 PC featuring 3270 terminal emulation was released later in October 1983, the motherboard had an Intel 8088 microprocessor running at 4.77 MHz, with a socket for an optional 8087 math coprocessor. IBM recognized soon after the IBM PCs release in 1981 that its five 8-bit I/O channel expansion slots were insufficient. An internal IBM publication stated in October 1981 about the number that In my opinion, it could be a problem, a BYTE Magazine article commented that DOS2.0 is more revolutionary and advanced than the computer itself. Unlike many hard disk systems on microcomputers at the time, the XT was able to boot directly off the drive, aside from the hard disk, a serial port card was also standard equipment on the XT, all other cards being optional. By the end of 1983, the XT was neck-and-neck with the original PC for sales, two were behind the floppy drive and shorter than PCs slots. The other six fit into the space as the PCs five slots. Most PC cards would not fit into the two slots, and some would not fit into the six standard-length, but narrower, slots. The floppy and hard drive adapters, the serial port card, the basic specification was soon upgraded to have 256 KB of RAM as standard. Expansion slots could be used for I/O devices or for memory expansion, available Video cards were initially the Monochrome Display Adapter and Color Graphics Adapter, with Enhanced Graphics Adapter and Professional Graphics Controller becoming available in 1984. The XT had a case similar to that of the IBM PC. It weighed 32 pounds and was approximately 19.5 inches wide by 16 inches deep by 5.5 inches high, the power supply of the original XT sold in the US was configured for 120 V AC only and could not be used with 240 V mains supplies. XTs with 240V-compatible power supplies were sold in international markets. Both were rated at 130 Watts, the operating system usually sold with the XT was PC DOS2.0 or, by the time the XT was discontinued in early 1987, DOS3.2. Like the original PC, the XT came with IBM BASIC in its ROM, the XT BIOS also displayed a memory count during the POST, unlike the PC. The XT was discontinued in the spring of 1987, replaced by the PS/2 Model 30, XT motherboards came in two different versions
29.
Unix
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Among these is Apples macOS, which is the Unix version with the largest installed base as of 2014. Many Unix-like operating systems have arisen over the years, of which Linux is the most popular, Unix was originally meant to be a convenient platform for programmers developing software to be run on it and on other systems, rather than for non-programmer users. The system grew larger as the system started spreading in academic circles, as users added their own tools to the system. Unix was designed to be portable, multi-tasking and multi-user in a time-sharing configuration and these concepts are collectively known as the Unix philosophy. By the early 1980s users began seeing Unix as a universal operating system. Under Unix, the system consists of many utilities along with the master control program. To mediate such access, the kernel has special rights, reflected in the division between user space and kernel space, the microkernel concept was introduced in an effort to reverse the trend towards larger kernels and return to a system in which most tasks were completed by smaller utilities. In an era when a standard computer consisted of a disk for storage and a data terminal for input and output. However, modern systems include networking and other new devices, as graphical user interfaces developed, the file model proved inadequate to the task of handling asynchronous events such as those generated by a mouse. In the 1980s, non-blocking I/O and the set of inter-process communication mechanisms were augmented with Unix domain sockets, shared memory, message queues, and semaphores. In microkernel implementations, functions such as network protocols could be moved out of the kernel, Multics introduced many innovations, but had many problems. Frustrated by the size and complexity of Multics but not by the aims and their last researchers to leave Multics, Ken Thompson, Dennis Ritchie, M. D. McIlroy, and J. F. Ossanna, decided to redo the work on a much smaller scale. The name Unics, a pun on Multics, was suggested for the project in 1970. Peter H. Salus credits Peter Neumann with the pun, while Brian Kernighan claims the coining for himself, in 1972, Unix was rewritten in the C programming language. Bell Labs produced several versions of Unix that are referred to as Research Unix. In 1975, the first source license for UNIX was sold to faculty at the University of Illinois Department of Computer Science, UIUC graduate student Greg Chesson was instrumental in negotiating the terms of this license. During the late 1970s and early 1980s, the influence of Unix in academic circles led to adoption of Unix by commercial startups, including Sequent, HP-UX, Solaris, AIX. In the late 1980s, AT&T Unix System Laboratories and Sun Microsystems developed System V Release 4, in the 1990s, Unix-like systems grew in popularity as Linux and BSD distributions were developed through collaboration by a worldwide network of programmers
30.
File descriptor
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In Unix and related computer operating systems, a file descriptor is an abstract indicator used to access a file or other input/output resource, such as a pipe or network socket. File descriptors form part of the POSIX application programming interface, a file descriptor is a non-negative integer, generally represented in the C programming language as the type int. This table records the mode with which the file has been opened, for reading, writing, appending and it also indexes into a third table called the inode table that describes the actual underlying files. To perform input or output, the passes the file descriptor to the kernel through a system call. The process does not have access to the file or inode tables. On Linux, the set of file descriptors open in a process can be accessed under the path /proc/PID/fd/, in Unix-like systems, file descriptors can refer to any Unix file type named in a file system. As well as files, this includes directories, block and character devices, Unix domain sockets. File descriptors can refer to other objects that do not normally exist in the file system, such as anonymous pipes. The FILE data structure in the C standard I/O library usually includes a low level file descriptor for the object in question on Unix-like systems, the overall data structure provides additional abstraction and is instead known as a file handle. The following lists typical operations on file descriptors on modern Unix-like systems, most of these functions are declared in the <unistd. h> header, but some are in the <fcntl. h> header instead. The fcntl function is used to various operations on a file descriptor. There are commands to get and set attributes associated with a descriptor, including F_GETFD, F_SETFD. The purpose of new operations is to defend against a certain class of TOCTTOU attacks. Openat faccessat fchmodat fchownat fstatat futimesat linkat mkdirat mknodat readlinkat renameat symlinkat unlinkat mkfifoat fdopendir Unix file descriptors behave in ways as capabilities. They can be passed between processes across Unix domain sockets using the system call. Note, however, that what is actually passed is a reference to an open file description that has mutable state, in operating systems that are specifically designed as capability systems, there is very rarely any mutable state associated with a capability itself. A Unix process file descriptor table is an example of a C-list
31.
Windows XP
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Windows XP is a personal computer operating system that was produced by Microsoft as part of the Windows NT family of operating systems. It was released to manufacturing on August 24,2001, however, in January 2000, both projects were shelved in favor of a single OS codenamed Whistler, which would serve as a single OS platform for both consumer and business markets. Windows XP was an advance from the MS-DOS based versions of Windows in security, stability. It introduced a significantly redesigned graphical user interface and was the first version of Windows to use product activation in an effort to reduce its copyright infringement. Despite some initial concerns over the new licensing model and product activation system, Windows XP eventually proved to be popular and widely used. It is estimated that at least 400 million copies of Windows XP were sold globally within its first five years of availability, sales of Windows XP licenses to original equipment manufacturers ceased on June 30,2008, but continued for netbooks until October 2010. Windows XP remained popular even after the release of newer versions, vistas 2009 successor, Windows 7, only overtook XP in total market share at the end of 2011. Extended support for Windows XP ended on April 8,2014, as of November 2016, Windows XP desktop market share makes it the fourth most popular Windows version after Windows 7, Windows 10 and Windows 8.1. Windows XP is still popular in some countries, Africa as a whole and in Asia, e. g. in China. A number of activity centers were planned, serving as hubs for email communications, playing music, managing or viewing photos, searching the Internet, however, the project proved to be too ambitious. Microsoft discussed a plan to delay Neptune in favor of an interim OS known as Asteroid, which would have been an update to Windows 2000, and since Neptune and Odyssey would be based on the same code-base anyway, it made sense to combine them into a single project. In June 2000, Microsoft began the technical beta testing process, Whistler was expected to be available in Personal, Professional, Server, Advanced Server. At PDC on July 13,2000, Microsoft announced that Whistler would be released during the half of 2001. Build 2257 featured further refinements to the Watercolor theme, along with the introduction of the two-column Start menu. Microsoft released Whistler Beta 1, build 2296, on October 31,2000, build 2410 in January 2001 introduced Internet Explorer 6.0 and the Microsoft Product Activation system. Making it very friendly for the user to use. Builds 2416 and 2419 added the File and Transfer Settings Wizard, on February 5,2001, Microsoft officially announced that Whistler would be known as Windows XP, where XP stands for experience. As a complement, the version of Microsoft Office was also announced as Office XP
32.
Windows NT
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Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It is a processor-independent, multiprocessing, multi-user operating system, the first version of Windows NT was Windows NT3.1 and was produced for workstations and server computers. It was intended to complement consumer versions of Windows that were based on MS-DOS, gradually, the Windows NT family was expanded into Microsofts general-purpose operating system product line for all personal computers, deprecating the Windows 9x family. NT was formerly expanded to New Technology but no longer carries any specific meaning, starting with Windows 2000, NT was removed from the product name and is only included in the product version string. NT was the first purely 32-bit version of Windows, whereas its consumer-oriented counterparts, Windows 3. 1x and it is a multi-architecture operating system. Initially, it supported several CPU architectures, including IA-32, MIPS, DEC Alpha, PowerPC, the latest versions support x86 and ARM. This lineage is made clear in Cutlers foreword to Inside Windows NT by Helen Custer and it has been suggested that Dave Cutler intended the initialism WNT as a play on VMS, incrementing each letter by one. However, the project was intended as a follow-on to OS/2 and was referred to as NT OS/2 before receiving the Windows brand. One of the original NT developers, Mark Lucovsky, states that the name was taken from the original target processor—the Intel i860, the letters were dropped from the names of releases from Windows 2000 onwards, though Microsoft described that product as being Built on NT Technology. A main design goal of NT was hardware and software portability, the idea was to have a common code base with a custom Hardware Abstraction Layer for each platform. However, support for MIPS, Alpha, and PowerPC was later dropped in Windows 2000, broad software compatibility was achieved with support for several API personalities, including Windows API, POSIX, and OS/2 APIs – the latter two were phased out starting with Windows XP. Partial MS-DOS compatibility was achieved via an integrated DOS Virtual Machine – although this feature is being phased out in the x86-64 architecture, NT supported per-object access control lists allowing a rich set of security permissions to be applied to systems and services. NT supported Windows network protocols, inheriting the previous OS/2 LAN Manager networking, Windows NT3.1 was the first version of Windows to use 32-bit flat virtual memory addressing on 32-bit processors. Its companion product, Windows 3.1, used segmented addressing, notably, in Windows NT3. x, several I/O driver subsystems, such as video and printing, were user-mode subsystems. In Windows NT4, the video, server, and printer spooler subsystems were moved into kernel mode, NTFS, a journaled, secure file system, was created for NT. Windows NT also allows for other file systems, starting with versions 3.1. Windows NT introduced its own model, the Windows NT driver model. With Windows 2000, the Windows NT driver model was enhanced to become the Windows Driver Model, which was first introduced with Windows 98, but was based on the NT driver model
33.
IBM PCjr
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The IBM PCjr was IBMs first attempt to enter the home computer market. It was manufactured for IBM in Lewisburg, Tennessee by Teledyne, the PCjr is also the first PC compatible machine that supports page flipping for graphics operation. The fully programmable 16-color palette logic in the PCjr allows any set of colors from among the 16-color RGBI color set—the same set of colors available in CGA text modes—in each mode. That is, in graphics mode, each pixel color value can be independently mapped to any one of the 16 real RGBI colors. When the BIOS is used to set a video mode, it sets up the PCjr palette table to emulate the CGA color palette for that mode. Programs specifically written to use PCjr graphics can subsequently reprogram the palette table to use any colors desired, palette changes must be made during horizontal or vertical blanking periods of a video frame in order to avoid corrupting the display. However, the provision of a vertical retrace interrupt simplifies this, the video hardware of the PCjr is the first to offer a vertical retrace interrupt, or any raster interrupt. In general, the PCjr video hardware can do anything that a CGA can, but the design of hardware-control registers, the functions of the CGA Mode Register and Color Select Register are implemented in the VGA using different registers. The Status Register has been moved into the VGA and has significant differences. Those are the registers, the light pen registers. Alteration of other CRTC registers cannot be assumed to produce the results from the PCjr video system as from the CGA. The 6845 CRTC and the VGA together are responsible for refreshing the internal DRAM of the PCjr. Additional external DRAM, in sidecar expansion modules, is refreshed separately, not by the CRTC, the PCjrs sound is provided by a Texas Instruments SN76489 which can produce three square waves of varying amplitude and frequency along with a noise channel powered by a shift register. Only one sound source can be selected at a time, the sources cannot be mixed, IBM claimed that an average of two wait states are added, but the designers of the Tandy 1000 claimed that six was a more accurate figure. Therefore, under some circumstances the 8088 in the PCjr actually can run at the rated 4.77 MHz, for infrared wireless operation, it was powered by common AA cells. With a built-in RF modulator, the PCjr can send video and audio to a TV, the PCjr Color Display sold by IBM included an internal amplified speaker, being the only IBM monitor in the PC line to do so. Cartridge BASIC enhances the standard IBM BASIC with commands to support the new video, further reinforcing the home-friendly goal, the PCjr also introduced two ROM cartridge slots on the front of the unit, meant to load software quickly and easily. The cartridge are plugged in from the front, prompting the computer to automatically reboot, loading and saving data from cartridge software is possible via the floppy drive
34.
Compaq
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Compaq was a company founded in 1982 that developed, sold, and supported computers and related products and services. Compaq produced some of the first IBM PC compatible computers, being the first company to reverse engineer the IBM Personal Computer. It rose to become the largest supplier of PC systems during the 1990s before being overtaken by HP in 2001, struggling in the aftermath of the dot-com bubble bust, as well as with a risky acquisition of DEC, Compaq was acquired for US$25 billion by HP in 2002. The Compaq brand remained in use by HP for lower-end systems until 2013 when it was discontinued, the company was formed by Rod Canion, Jim Harris and Bill Murto—former Texas Instruments senior managers. Murto departed Compaq in 1987, while Canion and Harris left under a shakeup in 1991, prior to its takeover the company was headquartered in a facility in northwest unincorporated Harris County, Texas, that now continues as HPs largest United States facility. Compaq was founded in February 1982 by Rod Canion, Jim Harris and Bill Murto, the three of them had left due to lack of faith and loss of confidence in TIs management, and initially considered but ultimately decided against starting a chain of Mexican restaurants. Each invested $1,000 to form the company, which was founded with the temporary name Gateway Technology, the name COMPAQ was said to be derived from Compatibility and Quality but this explanation was an afterthought. The name was chosen from many suggested by Ogilvy and Mather, the first Compaq PC was sketched out on a placemat by Canion while dining with the founders in a Houston pie shop. Their first venture came from Benjamin M. Rosen and Sevin Rosen Funds who helped the fledgling company secure $1.5 million to produce their initial computer. Overall, the managed to raise $25 million from venture capitalists. In contrast to Dell Computer and Gateway 2000, Compaq hired veteran engineers with an average of 15 years experience, under Canions direction, Compaq sold computers only through dealers to avoid potential competition that a direct sales channel would foster, which helped foster loyalty among resellers. By giving dealers considerable leeway in pricing Compaqs offerings, either a significant markup for more profits or discount for more sales, dealers had a major incentive to advertise Compaq. During its first year of sales, the company sold 53,000 PCs for sales of $111 million, Compaq went public in 1983 on the NYSE and raised $67 million. In 1986, it enjoyed record sales of $329 million from 150,000 PCs, in 1987, Compaq hit the $1 billion revenue mark, taking the least amount of time to reach that milestone. By 1991, Compaq held the fifth spot in the PC market with $3 billion in sales that year. Two key marketing executives in Compaqs early years, Jim DArezzo, other key executives responsible for the companys meteoric growth in the late 80s and early 90s were Ross A. In the United States, Brendan A. Mac McLoughlin led the companys sales organization after starting up the Western U. S. The soft-spoken Canion was popular with employees and the culture that he built helped Compaq to attract the best talent, at semi-annual meetings, turnout was high as any employee could ask questions to senior managers
35.
Compaq Portable
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The Compaq Portable is an early portable computer which was one of the first 100% IBM PC compatible systems. It was Compaq Computer Corporations first product, to be followed by others in the Compaq portable series and later Compaq Deskpro series. The Compaq Portable was announced in November 1982 and first shipped in March 1983, the 28 lb Compaq Portable folded up into a luggable case the size of a portable sewing machine. Its design was influenced by that of the Xerox NoteTaker, a computer developed at Xerox PARC in 1976. IBM responded to the Compaq Portable with the IBM Portable, Compaq sold 53,000 units in the first year with a total of $111 million in revenue, an American Business record. In the second year revenue hit $329 million setting an industry record, third year revenue was at $503.9 million, another US business record. The Compaq Portable has basically the same hardware as an IBM PC, transplanted into a luggable case, all Portables shipped with 128k of RAM and 1-2 double-sided disk drives. The machine uses a hybrid of the IBM MDA and CGA which supports the latters graphics modes. When using the internal monochrome monitor the 9x14 font is used, the user can use both IBM video standards, for graphics capabilities and high-resolution text. With a larger external monitor, the hardware is also used in the original Compaq Deskpro desktop computer. The only difficulty was the BIOS because of containing IBMs copyrighted code, Compaq solved this problem by producing a clean room workalike that performed all documented functions of the IBM PC BIOS, but was completely written from scratch. After DOS2. x and the IBM XT came out, although the Portable was not offered with a factory hard disk, users commonly installed them. BYTE wrote, after testing a prototype, that the Compaq Portable looks like a winner because of its portability, cost. Its reviewer tested IBM PC DOS, CP/M-86, WordStar, Supercalc, and several software packages. PC Magazine also rated the Compaq Portable very highly for compatibility and it praised the rugged hardware design and sharp display, and concluded that it was certainly worth consideration by anyone seeking to run IBM PC software without an IBM PC. This machine was the first of a series of Compaq Portable machines, old Computers - Compaq Portable CED in the History of Media Technology - Compaq Portable Obsolete Computer Museum - Compaq Portable description
36.
IBM PC compatible
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IBM PC compatible computers are those similar to the original IBM PC, XT, and AT, able to run the same software and support the same expansion cards as those. Such computers used to be referred to as PC clones, or IBM clones, Columbia Data Products built the first clone of the IBM personal computer by a clean room implementation of its BIOS. Early IBM PC compatibles used the computer bus as the original PC. The IBM AT compatible bus was named the Industry Standard Architecture bus by manufacturers of compatible computers. The term IBM PC compatible is now a historical description only, only the Apple Macintosh classic Mac OS and macOS kept significant market share without compatibility with the IBM personal computer, so consumers are typically identified as being a PC or Mac user. IBM decided in 1980 to market a low-cost single-user computer as quickly as possible in response to Apple Computers success in the microcomputer market. On 12 August 1981, the first IBM PC went on sale, there were three operating systems available for it. The least expensive and most popular was PC DOS made by Microsoft, in a crucial concession, IBMs agreement allowed Microsoft to sell its own version, MS-DOS, for non-IBM computers. The only component of the original PC architecture exclusive to IBM was the BIOS and this software would run on any machine using MS-DOS or PC-DOS. Software that directly addressed the hardware instead of making standard calls was faster, however, software addressing IBM PC hardware in this way would not run on MS-DOS machines with different hardware. The 808x computer marketplace rapidly excluded all machines which were not hardware-, the 640 KB barrier on conventional system memory available to MS-DOS is a legacy of that period, other non-clone machines, while subject to a limit, could exceed 640 kB. Rumors of lookalike, compatible computers, created without IBMs approval, by June 1983 PC Magazine defined PC clone as a computer accommodate the user who takes a disk home from an IBM PC, walks across the room, and plugs it into the foreign machine. Because of a shortage of IBM PCs that year, many customers purchased clones instead, Columbia Data Products produced the first computer more or less compatible to the IBM PC standard during June 1982, soon followed by Eagle Computer. Compaq announced its first IBM PC compatible in November 1982, the Compaq Portable, the Compaq was the first sewing machine-sized portable computer that was essentially 100% PC-compatible. The company could not copy the BIOS directly as a result of the decision in Apple v. Franklin. Each computer would have its own Original Equipment Manufacturer version of MS-DOS, any software written for MS-DOS would operate on any MS-DOS computer, despite variations in hardware design. This expectation seemed reasonable in the marketplace of the time. Until then Microsoft was based primarily on computer languages such as BASIC, the established small system operating software was CP/M from Digital Research which was in use both at the hobbyist level and by the more professional of those using microcomputers
37.
Intel 80286
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The Intel 80286 is a 16-bit microprocessor that was introduced on 1 February 1982. It was the first 8086 based CPU with separate, non-multiplexed, address and data buses and also the first with memory management, the 80286 was employed for the IBM PC/AT, introduced in 1984, and then widely used in most PC/AT compatible computers until the early 1990s. Although now long since obsolete for use in computers,80286 based processors are still widely used in embedded microcontroller applications. Intels first 80286 chips were specified for a maximum clockrate of 4,6 or 8 MHz, AMD and Harris later produced 16 MHz,20 MHz and 25 MHz parts, respectively. Intersil and Fujitsu also designed fully static CMOS versions of Intels original depletion-load nMOS implementation, the 6 MHz,10 MHz and 12 MHz models were reportedly measured to operate at 0.9 MIPS,1.5 MIPS and 2.66 MIPS respectively. The later E-stepping level of the 80286 was free of the several significant errata that caused problems for programmers, the 80286 was designed for multi-user systems with multitasking applications, including communications and real-time process control. It had 134,000 transistors and consisted of four independent units, address unit, bus unit, instruction unit, the significantly increased performance over the 8086 was primarily due to the non-multiplexed address and data buses, more address calculation hardware and a faster multiplier. It was produced in a 68-pin package including PLCC, LCC, the performance increase of the 80286 over the 8086 could be more than 100% per clock cycle in many programs. This was an increase, fully comparable to the speed improvements around a decade later when the i486 or the original Pentium were introduced. This was partly due to the address and data buses. They were performed by a unit in the 80286 while the older 8086 had to do effective address computation using its general ALU. Also, the 80286 was more efficient in the prefetch of instructions, buffering, execution of jumps, together with contemporary 80186,286 added new instructions, ENTER, LEAVE, BOUND, INS, OUTS, PUSHA, POPA, PUSH immediate, IMUL immediate, multi-bit shifts. The intel 80286 had a 24-bit address bus and was able to address up to 16 MB of RAM, however cost and initial rarity of software using the memory above 1 MB meant that 80286 computers were rarely shipped with more than one megabyte of RAM. Additionally, there was a performance penalty involved in accessing extended memory from real mode, the 286 was the first of the x86 CPU family to support protected mode. In addition, it was the first commercially available microprocessor with on-chip MMU capabilities and this would allow IBM compatibles to have advanced multitasking OSes for the first time and compete in the Unix-dominated server/workstation market. Several additional instructions were introduced in protected mode of 80286, which are helpful for multitasking operating systems, another important feature of 80286 is Prevention of Unauthorized Access. This is achieved by, Forming different segments for data, code, and stack, segment with lower privilege level cannot access the segment with higher privilege level. By design, the 286 could not revert from protected mode to the basic 8086-compatible real mode without a hardware-initiated reset, though it worked correctly, the method imposed a huge performance penalty
38.
Megabyte
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The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB, but sometimes MByte is used, the unit prefix mega is a multiplier of 1000000 in the International System of Units. Therefore, one megabyte is one million bytes of information and this definition has been incorporated into the International System of Quantities. However, in the computer and information fields, several other definitions are used that arose for historical reasons of convenience. A common usage has been to one megabyte as 1048576bytes. However, most standards bodies have deprecated this usage in favor of a set of binary prefixes, less common is a convention that used the megabyte to mean 1000×1024 bytes. The megabyte is commonly used to measure either 10002 bytes or 10242 bytes, the interpretation of using base 1024 originated as a compromise technical jargon for the byte multiples that needed to be expressed by the powers of 2 but lacked a convenient name. As 1024 approximates 1000, roughly corresponding to the SI prefix kilo-, in 1998 the International Electrotechnical Commission proposed standards for binary prefixes requiring the use of megabyte to strictly denote 10002 bytes and mebibyte to denote 10242 bytes. By the end of 2009, the IEC Standard had been adopted by the IEEE, EU, ISO, the Mac OS X10.6 file manager is a notable example of this usage in software. Since Snow Leopard, file sizes are reported in decimal units, base 21 MB =1048576 bytes is the definition used by Microsoft Windows in reference to computer memory, such as RAM. This definition is synonymous with the binary prefix mebibyte. Mixed 1 MB =1024000 bytes is the used to describe the formatted capacity of the 1.44 MB3. 5inch HD floppy disk. Semiconductor memory doubles in size for each address lane added to an integrated circuit package, the capacity of a disk drive is the product of the sector size, number of sectors per track, number of tracks per side, and the number of disk platters in the drive. Changes in any of these factors would not usually double the size, sector sizes were set as powers of two for convenience in processing. It was an extension to give the capacity of a disk drive in multiples of the sector size, giving a mix of decimal. Depending on compression methods and file format, a megabyte of data can roughly be, a 4 megapixel JPEG image with normal compression. Approximately 1 minute of 128 kbit/s MP3 compressed music,6 seconds of uncompressed CD audio. A typical English book volume in plain text format, the human genome consists of DNA representing 800 MB of data
