Precision Architecture RISC (PA-RISC) or Hewlett Packard Precision Architecture, is a general purpose computer instruction set architecture (ISA) developed by Hewlett-Packard from the 1980s until the 2000s.
HP PA-RISC 7300LC microprocessor
HP 9000 C110 PA-RISC workstation booting Debian GNU/Linux
Image: HP HP9000 PA RISC NS2 CPU Board A1027 26510 Rev B 03 (cropped) NS2 CPU HPC5 1FJ5 0005
Image: HP HP9000 PARISC PA7000 CPU 001 (cropped)
Reduced instruction set computer
In electronics and computer science, a reduced instruction set computer (RISC) is a computer architecture designed to simplify the individual instructions given to the computer to accomplish tasks. Compared to the instructions given to a complex instruction set computer (CISC), a RISC computer might require more instructions in order to accomplish a task because the individual instructions are written in simpler code. The goal is to offset the need to process more instructions by increasing the speed of each instruction, in particular by implementing an instruction pipeline, which may be simpler to achieve given simpler instructions.
The Sun Microsystems UltraSPARC processor is a type of RISC microprocessor.
An IBM PowerPC 601 RISC microprocessor
RISC-V prototype chip (2013)
