[Coco] Coco 1 & 2 differences

[Bill Pierce]

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