Hi Chris
All of the I/O, Floppy, video, modem and such, are through custom
Canon chips. I'm told that they emulate standard chips because
they originally built the prototypes with standard off the shelf parts.
I don't know if Canon used the same IC's in other machines or
if they were just for the Cat.
I don't recall seeing any PAL's but then I wasn't looking for
such. The reason I opened mine up was to replace the battery
for the CMOS RAM. I just looked around to see what else was there.
I recall noting that most of the memory was 16 bits wide except
for the CMOS that was 8 bit on even addresses.
When I decompiled the code for the CMOS, I noted that it use
an 8 bit instruction that was not used on later versions of the
68K.
Dwight
Date: Tue, 8 Jan 2008 12:55:46 -0800
From: chrism3667 at
yahoo.com
To: cctalk at
classiccmp.org
Subject: RE: contemplating selling my Canon Cat
Hey Dwight, being that I've yet to open mine up, is
there a.n.y proprietary logic on the mobo? Being that
it was released in 1987, I can't imagine there not
being something - even a PAL or whatnot.
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