[Coco] Unknown Coco 2 - Socketed

[Arthur Flexser]

I'd doubt it is any of the B models on account of its having an
original 6847 VDG (no lowercase).

I also note that the thing has an EPROM in place of one of its ROMs,
so I'd imagine it belonged to a tinkerer.  In which case, the
soldering of the main chips may well have been non-factory in origin.

It does seem to be a CoCo 2 rather than a CoCo 1, judging from the
fact that one of the PIAs is a 6822 rather than a 6821.

The absence of a decal may possibly indicate that the case bottom was
immersed in something to remove yellowing (presumably with the
components removed first).

Art

On Thu, May 30, 2013 at 10:38 PM, Kip Koon <computerdoc at sc.rr.com> wrote:
> Hi All,
> After some research on the internet, this unknown unlabeled 64K Coco 2 looks
> like a 26-3127B.  This is the top view.
> https://www.dropbox.com/s/kb29tld0dbihot5/64K%20Coco%202%20Motherboard%20Top
> %20View.jpg
> If you look closely, all the chips are socketed.
> Here's a left front view.
> https://www.dropbox.com/s/fcvniq2lgzxgcsx/64K%20Coco%202%20Left%20Side%20Mot
> herboard%20Front%20View.jpg
> Here's a right front view.
> https://www.dropbox.com/s/zgox8jjz1pcx629/64K%20Coco%202%20Right%20Side%20Mo
> therboard%20Front%20View.jpg
> Here is the PCB ID.
> https://www.dropbox.com/s/d6dofewhlizy9my/64K%20Coco%202%20%20PCB%20ID.jpg
> What do you all think?  Is this a 26-3127B?
> Kip
>
>
>
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