HP 12653A line printer interface

CuriousMarc curiousmarc3 at gmail.com
Tue Jul 11 00:24:16 CDT 2017

I thought I did, but what I have is the HP 12845B Line Printer interface
card, for which I could find the documentation. Unfortunately, looking at
the schematics, it does not seem to be based on a 12566B interface. Reading
some more, it is meant for the 2607/261x series of printers, which
apparently use a narrower 7 bit interface (the 12566 is a 16 bit interface
card). But maybe you can inspire yourself from it.

-----Original Message-----
From: cctech [mailto:cctech-bounces at classiccmp.org] On Behalf Of J. David
Bryan via cctech
Sent: Wednesday, July 05, 2017 2:36 PM
To: Classic Computing List
Subject: HP 12653A line printer interface

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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