[Coco] Pretty new screen

[Mike Pepe]

That's entirely possible. A great diagnostic is to listen carefully when
you power up the CoCo. If you hear a double click from the cassette
relay, the CoCo has initialized the hardware properly. If you get a
single click, it hasn't. 

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com]
On Behalf Of afra at aurigae.demon.co.uk
Sent: Thursday, March 05, 2009 8:58 AM
To: coco at maltedmedia.com
Subject: Re: [Coco] Pretty new screen

Quoting Bill <cwgordon at carolina.rr.com>:

> I woke up this morning and turned on my Coco, and I have a pretty new
> screen. Please look at http://www.sq1bbs.com/coco/coco-scr.jpg (this
is a
> close duplicate of the screen) and see if you can (maybe) figure out
what's
> wrong. I'm sure that there are some Cocoists who have seen this
before.

Which CoCo model is this ?

Whilst I agree with Robert who said that it would be impossible to  
tell for cirtain, the one time I have seen a patern like that before  
from a Dragon, which is basically the same as the CoCo 1/2, the  
problem was the 74LS244 buffer chip that sits between the processor  
data bus and the RAM/VDG data bus. Said LS chip had died and no data  
was getting writen to the RAM, and so the VDG was just pulling out  
whatever default patern was there.

Cheers.

Phill.


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