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Line 44: }}</ref> Other commercial machines that used writable microcode include the [[Burroughs Small Systems]] (1970s and 1980s), the Xerox processors ~~used~~ in their [[Lisp machine]]s and [[Xerox Star]] workstations, the [[Digital Equipment Corporation\|DEC]] [[VAX]] 8800 ("Nautilus") family, and the [[Symbolics]] L- and G-machines (1980s). Some DEC [[PDP-10]] machines stored their microcode in SRAM chips (about 80 bits wide x 2 Kwords), which was typically loaded on power-on through some other front-end CPU.<ref>http://pdp10.nocrew.org/cpu/kl10-ucode.txt</ref> Many more machines offered user-programmable writable control stores as an option (including the [[HP 2100]], DEC [[PDP-11\|PDP-11/60]] and [[Varian Data Machines]] V-70 series [[minicomputer]]s). The [[Mentec PDP-11#M11\|Mentec M11]] and [[Mentec PDP-11#M1\|Mentec M1]] stored its microcode in SRAM chips, loaded on power-on through another CPU. The [[Data General Eclipse MV/8000]] ("Eagle") had a SRAM writable control store, loaded on power-on through another CPU.<ref>{{cite web\|author=Mark Smotherman\|title=CPSC 330 / The Soul of a New Machine\|url=http://www.cs.clemson.edu/~mark/330/eagle.html\|quote=4096 x 75-bit SRAM writeable control store: 74-bit microinstruction with 1 parity bit (18 fields)}}</ref>

Control store: Difference between revisions