4 Jul
2006
4 Jul
'06
9:19 a.m.
On 7/4/2006 at 11:31 AM Jules Richardson wrote:
In fact, maybe that was another intended use (which
never happened) for
the board that's used to connect a PC to the expansion chassis? (I've
never
seen or looked at details of one of those boards - but
presumably it's
full of
generic I/O lines)
That's unlikely--the expansion board set was mostly buffers and receivers
that worked directly off the bus lines. IBM did offer a Data Acquistiion
board, however. I just don't think they ever saw a need for generic
parallel I/O, though (and I'm not 100% certain of this), the sample circuit
for the prototype adapter involved driving an 8255.
Cheers,
Chuck