Date   : Sun, 07 Aug 2005 01:01:21 +0100
From   : Richard Kilpatrick <oldcomputers@...>
Subject: Re: 80186 co-pro

On 6 Aug 2005, at 20:20, Phil Blundell wrote:

> Thanks.  I'll look around for it.
>
> I also found a couple of partially-depopulated 80286 external
> coprocessor boards.  Does anybody have a circuit diagram of these,  
> or a
> photo of an assembled board that I could use to figure out what  
> goes in
> the empty sockets?
>
> FWIW, the one I have in front of me right now is missing:
>
> 32 off 16-pin DIPs, in the southwest corner (presumably DRAM).
> 2 off 28-pin DIPs, on the north side (presumably EPROMs).
> 1 off 40-pin DIP, on the north side between the Tube ULA and the  
> EPROMs.
> I have no idea what this one is.

Does it look like this?

http://www.dmc12.demon.co.uk/retrotech/largeimages/80286CoPro.JPG

Yes. Some ABC310s were in the wild, though in fairness, I don't think  
the list as a whole has encountered many more than this one ;)

Richard

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