5 Jul
2000
5 Jul
'00
8:35 p.m.
I never owned one of these boards, but I think the 48 MHz crystal is there
for reasons other than cost. All the frequencies desirable for processing
FD's fall out of that one if you divide by 3 and by 4.
Dick
----- Original Message -----
From: Mike Ford <mikeford(a)socal.rr.com>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, July 05, 2000 10:29 PM
Subject: CPS Option Board
>I'd like to know more about the Central Point
board. If it can read
things
Since I have one laying on my desk...
Barely the length of a short ISA slot, with fingers on the end like a
floppy drive edge connector, as well as a set of header pins for a floppy
drive cable that goes to the "real" drive. The card is in series with the
floppy drive cable.
It has one main chip, about 8051 sized, maybe 60 pins:
Transcopy 3 c CPS
TC19GO32AP-0036
Japan 8819EA! the ! could be just a vertical line.
There is a 48 mhz crystal, and a 1987 copyright. Two sets of jumpers seem
to select between PC/XT and AT/Compaq, another set looks like DMA1 or
DMA2.
Remaining chips are a LS245 to the ISA bus, a 7406 by the PC/XT jumpers,
and a 8812S UM8326B next to the crystal.
*********
My guess is that knowing what the big chip is and does is the only
"catch",
the rest could be traced out in a few minutes.