IBM Portable Personal Computer

From: PG Manney <manney_at_nwohio.nwohio.com>
Date: Wed Jan 28 20:55:04 1998

> I've got the Techrefs in front of me (PC, and PC/XT)
>
> The PC motherboard schematics show that all 5 expansion slots are wired
> in parallel. There's nothing odd about any of them.

H'm. I use third-party books. Suppose if I wrote the author they'd put out
an updated edition?

>
> The schematics for both versions of the XT motherboard (64K-256K and

<Snip>

> > FWIW, I've run a variety of cards in XT slot 8 and PC slot 5 with no
> > problems.
>
> On clones, sure. But I have a genuine IBM PC/XT on my desk and the
> built-from-a-kit 8255 card wouldn't work in slot 8 without a little extra

> logic (which I made from unused gates on the card).

Nope. Real true-blues. Maybe it gets more tolerant with time?

manney
Received on Wed Jan 28 1998 - 20:55:04 GMT