[Coco] Has anyone ever seen one of these? - Unassembled CoCo2

[Bill Pierce]

Ed, no one knows if the prototype was the same as the prodution GIME or if it even emulates the GIME at all. I don't think any form of docs were ever found and none of the people envolved remember too much about what was done.
The Coco wiki page has a pic of the board:
http://en.wikipedia.org/wiki/TRS-80_Color_Computer#Prototypes_and_rare_versions
There are also some detailed pics in The Color Computer Archives:
http://www.colorcomputerarchive.com/coco/Hardware/Coco%203%20Prototype/
 

Bill Pierce
"Today is a good day... I woke up" - Ritchie Havens
 

My Music from the Tandy/Radio Shack Color Computer 2 & 3
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-----Original Message-----
From: Zippster <zippster278 at gmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Sun, Jan 11, 2015 8:33 pm
Subject: Re: [Coco] Has anyone ever seen one of these? - Unassembled  CoCo2


That’s what I mean, the logic circuit so it’s functions can be
duplicated.  Without that it would be an onerous task replicating it.

And without the GIME, no new CoCo3.

Who has access to the CoCo3 prototype?  And would it’s circuitry
actually be the same as the GIME?  Even if it was, what about the
code for the PALs?

If the documentation is long gone that would be a shame.
I suppose it’s hopelessly buried somewhere….

- Ed


> On Jan 11, 2015, at 5:57 PM, nickma2 at optusnet.com.au wrote:
> 
> I wish there was!   :)
> 
> I don't think "schematic" is the right word. The custom chip is some
> sort of "programmable at the factory" device (I don't know exactly)
> but what is possible (and I don't know why it hasn't been done yet) is
> to create a schematic of the CoCo3 prototype which has the GIME using
> descrete logic parts (plus a few custom PAL chips).
> 
> Nick
> 
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