[Coco] Coco 1 & 2 differences

[Stephen Spiller]

There were two versions of the 6847.  The original and the "T1" which included a full lower-case character set and a minor change to the pins to incorporate a latch that used to be needed external to the chip.
 
There's some info here:
http://www.cocopedia.com/wiki/index.php/TRS-80_Color_Computer#Lower_Case_and_the_6847T1

 
> Date: Thu, 23 May 2013 20:35:17 -0400
> From: retrocanada76 at gmail.com
> To: coco at maltedmedia.com
> Subject: Re: [Coco] Coco 1 & 2 differences
> 
> speaking of CoHR i made a patch to it. So now it understand OS-9 cursor
> codes intead of its very own esc codes. It runs fast because it understands
> the cursor on/off codes too. In fact i implemented all os-9 codes.
> 
> Now i can run minted on it :) too bad not enough memory is left to run
> dynacalc :(
> 
> seems most of the people are coco3 and nobody cares for the coco1&2 :'(
> 
> 
> 
> On Thu, May 23, 2013 at 8:29 PM, Bill Pierce <ooogalapasooo at aol.com> wrote:
> 
> >
> > Hi,
> > Are there any differences in the VDG chip in the Coco 1 & 2?
> > I seem to remember someone comparing these before but can't remember where
> > I saw the info. I know there were differences in the serial port use. Are
> > there any other differences?
> > I have a Coco 1 (26-3003A) "F" board, 64k, and the reason I'm asking is
> > that I created a NitrOS-9 boot using the CoHR driver and it won't boot. I
> > can switch the CoHR out to the CoVDG and it boots fine. That's why I was
> > wondering about the VDG chip.
> >
> > Thanks
> >
> > Bill Pierce
> > My Music from the Tandy/Radio Shack Color Computer 2 & 3
> > https://sites.google.com/site/dabarnstudio/
> > Co-Webmaster of The TRS-80 Color Computer Archive
> > http://www.colorcomputerarchive.com/
> > Co-Contributor, Co-Editor for CocoPedia
> > http://www.cocopedia.com/wiki/index.php/Main_Page
> > E-Mail: ooogalapasooo at aol.com
> >
> >
> > --
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> >
> 
> 
> 
> -- 
> Long live the CoCo
> 
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