1.
Computer virus
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A computer virus is a type of malicious software program that, when executed, replicates by reproducing itself or infecting other computer programs by modifying them. Infecting computer programs can include as well, data files, or the sector of the hard drive. When this replication succeeds, the areas are then said to be infected with a computer virus. The term virus is also commonly, but erroneously, used to refer to types of malware. The majority of active malware threats are actually trojan horse programs or computer worms rather than computer viruses, the term computer virus, coined by Fred Cohen in 1985, is a misnomer. Virus writers use social engineering deceptions and exploit detailed knowledge of security vulnerabilities to gain access to their hosts computers and computing resources. Computer viruses currently cause billions of dollars worth of damage each year, due to causing system failure, wasting computer resources, corrupting data, increasing maintenance costs. The work of von Neumann was later published as the Theory of self-reproducing automata, in his essay von Neumann described how a computer program could be designed to reproduce itself. Von Neumanns design for a computer program is considered the worlds first computer virus. In 1972, Veith Risak, directly building on von Neumanns work on self-replication, the article describes a fully functional virus written in assembler programming language for a SIEMENS 4004/35 computer system. In 1980 Jürgen Kraus wrote his diplom thesis Selbstreproduktion bei Programmen at the University of Dortmund, in his work Kraus postulated that computer programs can behave in a way similar to biological viruses. The Creeper virus was first detected on ARPANET, the forerunner of the Internet, Creeper was an experimental self-replicating program written by Bob Thomas at BBN Technologies in 1971. Creeper used the ARPANET to infect DEC PDP-10 computers running the TENEX operating system, Creeper gained access via the ARPANET and copied itself to the remote system where the message, Im the creeper, catch me if you can. The Reaper program was created to delete Creeper, in fiction, the 1973 Michael Crichton sci-fi movie Westworld made an early mention of the concept of a computer virus, being a central plot theme that causes androids to run amok. Alan Oppenheimers character summarizes the problem by stating that. theres a pattern here which suggests an analogy to an infectious disease process. To which the replies are stated, Perhaps there are similarities to disease and. In 1982, a program called Elk Cloner was the first personal computer virus to appear in the wild—that is, outside the single computer or lab where it was created. Written in 1981 by Richard Skrenta while in the grade at Mount Lebanon High School near Pittsburgh, it attached itself to the Apple DOS3.3 operating system
2.
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
3.
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
4.
Lahore
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Lahore is the capital city of the Pakistani province of Punjab. It is the second most populous city in Pakistan and the 32nd most populous city in the world, the city is located in the north-eastern end of Pakistans Punjab province, near the border with the Indian state of Punjab. Lahore is ranked as a world city, and is one of Pakistans wealthiest cities with an estimated GDP of $58.14 billion as of 2014. Lahore is the cultural centre of the Punjab region, and is the largest Punjabi city in the world. The city has a history, and was once under the rule of the Hindu Shahis, Ghaznavids, Ghurids. Lahore reached the height of its splendour under the Mughal Empire, the city was contested between the Maratha Empire and Durrani Empire, then became capital of the Sikh Empire, before becoming the capital of the Punjab under British rule. Following the independence of Pakistan in 1947, Lahore became the capital of Pakistans Punjab province, Lahore is one of Pakistans most liberal and cosmopolitan cities. It exerts a strong influence over Pakistan. Lahore is a centre for Pakistans publishing industry, and remains the foremost centre of Pakistans literary scene. The city is also a centre of education in Pakistan. Lahore is also home to Pakistans film industry, Lollywood, and is a centre of Qawwali music. The city is much of Pakistans tourist industry, with major attractions including the old Walled City. Lahore is also home to the UNESCO World Heritage Sites of Lahore Fort, the etymology of Lahore is uncertain, but according to legend the city was once known as Lavapura, in honour of Prince Lava of the Hindu epic poem, the Ramayana. Lahore Fort also contains a vacant Lava temple, dedicated to the founder of the city. Lahore was called by different names throughout history, to date there is no conclusive evidence as to when it was founded. Lahore is described as a Hindu principality in the Rajput accounts, keneksen, the founder of Suryavansha, is believed to have migrated out from the city. The Solanki tribe, belonging to Amukhara Pattan, which included the Bhatti Rajputs of Jaisalmer, Lahore appears as the capital of the Punjab for the first time under Anandapala – the Hindu Shahi king who is referred to as the ruler of –after leaving the earlier capital of Waihind. Few references to Lahore remain from before its capture by Sultan Mahmud of Ghaznavi in the 11th century, the sultan took Lahore after a long siege and battle in which the city was torched and depopulated
5.
Pakistan
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Pakistan, officially the Islamic Republic of Pakistan, is a federal parliamentary republic in South Asia on the crossroads of Central Asia and Western Asia. It is the sixth-most populous country with a population exceeding 200 million people, in terms of area, it is the 33rd-largest country in the world with an area covering 881,913 square kilometres. It is separated from Tajikistan by Afghanistans narrow Wakhan Corridor in the north, Pakistan is unique among Muslim countries in that it is the only country to have been created in the name of Islam. As a result of the Pakistan Movement led by Muhammad Ali Jinnah and it is an ethnically and linguistically diverse country, with a similarly diverse geography and wildlife. Initially a dominion, Pakistan adopted a constitution in 1956, becoming an Islamic republic, an ethnic civil war in 1971 resulted in the secession of East Pakistan as the new country of Bangladesh. The new constitution stipulated that all laws were to conform to the injunctions of Islam as laid down in the Quran. Pakistan has an economy with a well-integrated agriculture sector. The Pakistani economy is the 24th-largest in the world in terms of purchasing power and it is ranked among the emerging and growth-leading economies of the world, and is backed by one of the worlds largest and fastest-growing middle classes. The post-independence history of Pakistan has been characterised by periods of military rule, the country continues to face challenging problems such as illiteracy, healthcare, and corruption, but has substantially reduced poverty and terrorism and expanded per capita income. It is also a member of CERN. Pakistan is a signatory to the Kyoto Protocol, the Paris Agreement, the name Pakistan literally means land of the pure in Urdu and Persian. It is a play on the word pāk meaning pure in Persian and Pashto, the letter i was incorporated to ease pronunciation and form the linguistically correct and meaningful name. Some of the earliest ancient human civilisations in South Asia originated from areas encompassing present-day Pakistan, the earliest known inhabitants in the region were Soanian during the Lower Paleolithic, of whom stone tools have been found in the Soan Valley of Punjab. The Vedic Civilization, characterised by Indo-Aryan culture, laid the foundations of Hinduism, Multan was an important Hindu pilgrimage centre. The Vedic civilisation flourished in the ancient Gandhāran city of Takṣaśilā, the Indo-Greek Kingdom founded by Demetrius of Bactria included Gandhara and Punjab and reached its greatest extent under Menander, prospering the Greco-Buddhist culture in the region. Taxila had one of the earliest universities and centres of education in the world. At its zenith, the Rai Dynasty of Sindh ruled this region, the Pala Dynasty was the last Buddhist empire, which, under Dharampala and Devapala, stretched across South Asia from what is now Bangladesh through Northern India to Pakistan. The Arab conqueror Muhammad bin Qasim conquered the Indus valley from Sindh to Multan in southern Punjab in 711 AD, the Pakistan governments official chronology identifies this as the time when the foundation of Pakistan was laid
6.
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
7.
Lahore Junction railway station
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Lahore Junction railway station is the central railway station in Lahore, Punjab, Pakistan. It is situated at the convergence of Empress Road, Allama Iqbal Road, the station building is owned by Pakistan Railways and also serves as its headquarters. Lahore Junction station was constructed by Mian Mohammad Sultan Chughtai, an official of the Mughal Empire. The station served as the headquarters for the Punjab Railway and later would serve as the terminus of the Scinde, Punjab & Delhi Railway. It remains a legacy of the extensive railway network established during the British Raj. The station was affected during the riots which followed the Partition of the British Indian Empire. Similar to the situation with migrating Muslims from Delhi, Lahores Hindus. Lahore Junction Station is equipped with all basic facilities, the station has current and advance reservation offices for Pakistan Railways as well as cargo and parcel facilities. Retail shops are mainly on platforms 1 and 2, including restaurants such as Pizza Hut. The following trains originate/stop/terminate at Lahore Junction station, The film Bhowani Junction by MGM starring Ava Gardner, Pakistan Railways List of railway stations in Pakistan Railway station layout Pakistan Railways official site A short history of Lahore railway station
