[Coco] Re: Color Computer 3 prototype

[jdaggett at gate.net]

Mark

It maybe true that the board is touchy. Notice the label by where the 
power leads solder in. It states no more than 4.75 VDC. TTL is 
tolerant to 5.75 VDC. That may suggest that trransients are a 
problem and that can cause flaky operation. Poor grounding or 
power and ground routing and insufficient bypass for all frequencies 
is a possible cause. 

The mixture of NMOS and TTL can be a problem. TTL is better 
tolerant to transients than NMOS and CMOS. 

james 

On 21 Jan 2005 at 5:47, Mark Marlette wrote:

Date sent:      	Fri, 21 Jan 2005 05:47:12 -0600
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From:           	Mark Marlette <mark at cloud9tech.com>
Subject:        	Re: [Coco] Re: Color Computer 3 prototype
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> Check with Mark H. and see if he recalls any documentation. Boisy do
> you recall?? Boisy mentioned to me that this board has VERY touchy
> operation. Sounds like Curtis's TC-9 from FHL that I upgraded for him.
> Major electrical improvements placed in that machine for smooth
> operation.