Re: Pet 8088 coprocessor board for sale on Ebay

From: Michał Pleban <>
Date: Sun, 16 Jan 2011 19:34:21 +0100
Message-ID: <>

W dniu 2011-01-15 20:12, pisze:

> If I understand you correctly, you have a 720 where it works and a 
> 610 where it doesn't work. What about swapping ROMs, PALs etc. 
> until the 720 doesn't work and the 610 does?

The PLA cannot be swapped easily because it has a different pinout. I
need to build an adapter, which I will do when time permits.

I don't really think that swapping EPROMs would help either. The board
behaves in a way that strongly suggests a hardware issue (sometimes it
works to some extent).

Most helpful right now would be the disassembly of the MS-DOS loader, to
see what causes the message "BAD INIT TABLE" to be displayed. i think
that when the cause of this message is known, it will give many useful
hints on why the board doesn't work.


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Received on 2011-01-16 19:00:09

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