24 Dec
2015
24 Dec
'15
2:11 a.m.
On Mon, Dec 21, 2015 at 1:18 PM, Noel Chiappa <jnc at 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.