HP 12653A line printer interface

J. David Bryan jdbryan at acm.org
Wed Jul 5 16:35:37 CDT 2017

Does anyone have an HP 12653A line printer interface?

It is used to connect an HP 21xx/1000 CPU to an HP 2767A line printer.  I 
am unable to find a manual for this card, but the HP "General Purpose 
Register Diagnostic" manual suggests that it is a modified HP 12566B 
Microcircuit interface.  I'm trying to determine what modifications were 
made, so that I can model it accurately in the SIMH/HP2100 simulator.

If anyone has this card and wouldn't mind sending me high-resolution photos 
of the front and back, I'd be most grateful.

                                      -- Dave

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