Re: Pet 8088 coprocessor board for sale on Ebay

From: Michał Pleban <>
Date: Mon, 17 Jan 2011 17:24:03 +0100
Message-ID: <>

W dniu 2011-01-16 20:20, B Degnan pisze:

> I have the listing for the 8088/6509 interprocess communications ROM, on
> the card.  I will post it to
> ..momentarily so it will be with the schematic online.

Thanks for posting it. I am analyzing the code with Ruud schematics to
see what port lines are responsible for what. It should help us to write
our own 8088 programs, maybe this would also be that way to check why
the board does not work.

I am looking for a way to transfer the MSDOS.SYS file from the CBM disk
to my PC for disassembly. I tried extracting it from the D80 archive,
but I can't quite figure out how the sectors are arranged with regard to
FAT entries, and some sectors are filles with all 00 :-(


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Received on 2011-01-17 17:00:13

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