On Mon, Dec 21, 2015 at 1:18 PM, Noel Chiappa <j...@mercury.lcs.mit.edu> wrote: > In part, along with the bad diagram, I was thrown by a combo of the fact that > i) the DEC part numbers for the control chip started with 23- (which seems to > be a ROM part indicator),
The 23- prefix was for all programmable ICs, whether mask-programmable or field-programmable, not just ROMs/PROMs/EPROMs. The control chip uses mask-programmed PLAs for macroinstruction decode.
