[GreenKeys] MCT S-100 Serial board - Ever seen one? CL and/or RS-232?

[drlegendre .]

Kind of a long shot, but I can't think of anywhere better to ask..

I have here a completely un-documented serial communications board, for
S-100 computers. Photos can be seen at:

https://nerp.net/~legendre/altair/mct_serial_01.jpg
https://nerp.net/~legendre/altair/mct_serial_02.jpg

All I know, is that it was made/sold by "MCT" - beyond that, there isn't
even a model number on it, far as I can see. The few markings present seem
to be for the PCB mask / artwork.

Does anyone have experience with this board? Are there any documents
available? I'd +really+ like to get it on-line so I can do something with
my 8800, other than stare at the blinkenlights.

I understand that some of the early S-100 serial boards supported both
RS-232 and 20mA current-loop standards. As for this one, I'm fairly sure
it's capable of RS-232 operation, but I have no idea if it's CL capable.

But until I know how it pins-out, and most importantly, where it maps in
memory, it might as well be a doorstop - and a poor one at that.
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