Western Electric CP32 Eight 1x4 Latched Crosspoints Info?

[segaloco]

I was curious if anyone might happen to have any info hand on the Western Electric CP32 crosspoint card.  The PCB gives ED code ED1P534-30 and SP code SP1P112-01, neither of which documents I've been able to find online.

I've done some reverse engineering and have a pretty good idea of which signals are which.  Most components I can identify, although two are a bit obscure:

WE41EF - This is given as a seven-inverter in the Functional Index of the 1976 Silicon Integrated Circuits Linear Families manual (but not 1973).  I do not have the corresponding Digital Families manual which would contain the actual datasheet. However, I suspect something resembling an equivalent 74-series IC, for instance GND and Vcc are in the usual corner positions.

WE41HC - This one is not listed in any literature I have.  Might be a 2->4 decoder, as there are 8, one for each crosspoint set, and in each case 4 pins go out, one to each relay.  Not sure though, I haven't traced all the connections yet.

In any case, most of the pins are I/O pins into the crosspoint matrix, but there are several control pins going into the inverters and a set of OR gates, so I should be able to then see how these gates talk to the latches and 41HC chips.  In any case, the external interface of the card is the control signals to latch/route, several inverting inputs that then influence the latches, and a NOR gate similarly probably for identifying which crosspoint is being manipulated by the other signals.

Also of significance is the card itself.  Based on some other literature, I think it may constitute a "JW-type" circuit card, although the reference I'm looking at is a single picture of cards in a PROETEL microcomputer (MAC-8 driven telecom computer) which refer to them as "JW", although I think the card in the picture is a bit deeper than these, I don't know if JW implies just the mating end or the total depth of the card as well.

Anywho, I'll be working on a schematic either way and if I get that together will post it here.  I want to document how these work because admittedly I'm going to be using a couple for PCB trace cutting experiments, so I'll have to strip everything down to the substrate.  Not to worry, I'm going to try and get all the chips and components off non-destructively so I can also bin them for other future projects, hopefully I can do this with minimal loss.  I intend to keep at least two of these CP32 cards completely intact so I can experiment with them as decoders in the system I'm building.  Either way, it's going to be relatively slow goings until I either find a JW backplane *or* figure out a pathway to getting one fabricated.

[5415551212]

Its an admirable project, a little above my pay grade but keep posting your research here.
For making PCB's I have been learning 'kicad'.
Its a opensource program I am sure your probably familiar with it.

[segaloco]

Ah yes I've heard a lot about that in my PCB studies.  I want to try my hand at hand-tracing at least one board, just to get an appreciation for it, but if I find myself doing anything at scale, I'll certainly look to outside options.