IBM 5140 - schematics?

Tony Duell ard.p850ug1 at
Sat Apr 28 11:27:02 CDT 2018

On Sat, Apr 28, 2018 at 3:57 PM, Anders Nelson via cctalk
<cctalk at> wrote:
> Hey all,
> I have an IBM 5140 portable with a printer but I'd really like to use it as
> a terminal among other things. Any chance there's documentation available
> for that Centronics connector or another internal header with RS232 or
> whatever?

I've never seen schematics for this machine (and as I don't own one, I
haven't reverse-engineered it).

However there is a technical reference manual,


which I think I got from Bitsavers. Page 46 and following of that .pdf
(page 2-37 and following of the original manual) give the pinout and
signals on the 'I/O Channel connector' which I think is the one you
are asking about. Looks to be pretty much the 8 bit ISA bus

It's a 72 pin connector, good luck in finding something to fit it!


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