Advanced RISC Computing

Microsoft operating system family

instruction set architecture

thumb|A Toshiba R4000 microprocessor thumb|A Integrated Device Technology|IDT R4000 microprocessor thumb|MIPS R4000 die shot The R4000 is a microprocessor developed by MIPS Computer Systems that implements the MIPS III instruction set architecture (ISA). Officially announced on 1 October 1991, it was one of the first 64-bit microprocessors and the first MIPS III implementation. In the early 1990s, when RISC microprocessors were expected to replace CISC microprocessors such as the Intel i486, the R4000 was selected to be the microprocessor of the Advanced Computing Environment (ACE), an industr

Unix workstation from Silicon Graphics

thumb|right|250px|The model identification "medallion" of a DECstation 5000 Model 120 thumb|right|250px|DECstation 5000 Model 200 with top cover removed

Computing standard based on MIPS architecture