dumping Western Digital Microms (PDP-11, WD16, Pascal Microengine)

Eric Smith spacewar at gmail.com
Thu Dec 24 01:11:48 CST 2015

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.

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