On Sat, 27 Apr 2002, Tony Duell wrote:
Well, I'm now the (proud?) owner of a Commodore PC-20-III. Ironically, this
A little more information, now that I've found my folder of PC10/PC20
schematics...
The 'motherboard' is really I/O only (looks to be a serial port, a
parallel port, and an FDC). The CPU card plugs into a special slot on
this board -- it appears the CPU is an 8088 with (optional?) 8087
coprocessor.
There were at least 3 video cards : Monochrome (looks to be MDA), Color
(looks to be CGA) and 'Advanced Monochrome' (looks to be Hercules). I
can't be absolutely sure about that because all the cards have programmed
PALs or PLAs on them and I don't have any info on what's inside them. The
only one to have a composite output is the Color one. And none of them
have DIP switches that I can see.
Tony, the Paradise Autoswitch EGA 350 Card has two RCA jacks and a DE-9
receptacle along with an 8-position DIP switch. The unit will auto
select between EGA, CGA, and Hercules or MDA at the DE-9. The RCA jacks
are not composite video and are to conform to the IBM EGA card
configuration.
- don
So I would guess the card you have with the DIP
switches is a generic
clone card. As is the one with the 2 DA15s on it.
-tony