Editing Pyramid Technology (section)

===MIServer===
Like many of the early multiprocessor vendors, Pyramid turned to "commodity" RISC CPUs when they started to become practical. Pyramid continued to use their own RISC design until the release of the MIServer S product line. Pyramid released a series of register window-based machines as a 9000 line follow on. These were known as the MIServer starting in 1989. They supported up to ten CPUs with performance of about 12&nbsp;MIPS each. The MIServer was replaced in 1991/2 with the MIServerT and later followed up with the MIServer S and ES, Pyramid's first [[R3000]]-based machine. The first machines in the series shipped with anywhere from 4 to 12 R3000s running at 33&nbsp;MHz, with top-end performance around 140&nbsp;MIPS. Later high-end MIServer ES machines had up to 24 CPUs, also at 33&nbsp;MHz. The operating system for the MIPS based systems was [[DC/OSx]], a port of [[AT&T Corporation|AT&T]] [[UNIX System V|System V Release 4]] (SVR4).