[Coco] Trying to ID CoCo 1 board.

[Mike Pepe]

Phill Harvey-Smith wrote:
> Hi,
> 
> Now I have fixed the problem with the keyboard on this machine I want to 
> try and upgrade it to 64K, it's currently at 16K, and I have a bunch of 
> spare 4164s, and socketed RAM chips so why not :)
> 
> Anyway I'm trying to ID the version of the board, and cannot work out 
> which version it is, the number under the cartrage port is :
> 
> "8709222  A"
> 
> The board does have 6 jumpers, some marked 4/16m, others 16/64 and the 
> high/low one I know that the 16/64 ones will have to be in the 64 
> position to ensure the correct voltage/address line routing and I know I 
> will have to fit R83, which I presume is in Z7 from the SAM. However I 
> don't know if I'll have to make any other patches to enable 64K.
> 
> I can probably dig out my digicam and take a piccy if that would help ID 
> it :)
> 
> Pictures here : http://daria.bio.warwick.ac.uk/~bshu/CoCo/
> 
> Cheers.
> 
> Phill.

That looks like a D board, though I'm not familiar with that part 
number. It might be a PAL board part number. However the layout is 
definitely a D board.

It's been hacked to 64K it seems too.