2 Dec
2001
2 Dec
'01
2:31 p.m.
On Sun, 2 Dec 2001, Robert Schaefer wrote:
RIGHT
Well, I made a few mistakes. I think it's a PC,
not a PC/XT. Five 8 bit
slots, a DIN tape port on the back, fully populated with 4 banks of 9 4564.
It is a MCA video card, the `black and white/parallel' was a dead giveaway.
^^^
CAREFUL! That would be an MDA (Monochrome Display Adapter), or more
accurately MDP (Monochrome Display & Printer). MCA is MicroChannel
Architecture (as used in PS/2), which it most definitely is NOT.
picky, picky, ...
That's a lot bigger than I expected! The board
has only 74 series logic on
it, apart from the ram, so I guess all support for the ports on it are
contained on the daughtercard. A closer look indicates that all the readily
visible traces coming from the ports end up on the single-row header.
RIGHT
If those chips
are not on the board, then maybe the external connectors
just link to the row of sockets on the PCB near them, and you need the
daughterboard for any I/O functions.
Yup, that's my current guess too.