28 Apr
2018
28 Apr
'18
1 p.m.
6280655_PC_Convertable_Technical_Reference_Volume_1_Feb86.pdf
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
signals.
It's a 72 pin connector, good luck in finding something to fit it!
-tony
Surprised there is no regular rs232 port