Re: Pet 8088 coprocessor board for sale on Ebay

From: Michał Pleban <>
Date: Sun, 16 Jan 2011 20:08:57 +0100
Message-ID: <>

W dniu 2011-01-16 20:00, Hoffmann-Vetter, Martin pisze:

> Have you read this:

Yes, but this info is also mostly speculation :-(

> Try it! The BASIC is the same on the low profile and the high profile. Only different version about the used memory exists.
> The Kernal is usable an both profile versions, too. It detect the hardware (profile version) about a externaly hard jumpered pin from the tpi.
> My last info is: You must use the correct basic roms!

OK, I will swap all the EPROMs, it's an easy task so I shouldn't find
excuses to avoid that :-) We should eliminate all possibilities.

> That's the best idea. Becauce we know the correct requirement for the coprocessor board. The question is, who writes this message? The MS-DOS loader at the 6509 side or the firmware at the 8088 side?

As far as I can see, it is written by code inside MSDOS.SYS file on the
8088 side. Now how to extract this file for disassembling...


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Received on 2011-01-16 20:00:12

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