[Coco] (no subject)

[Richard E. Crislip]

On Friday, December 30, 2011 02:07:02 PM Bill Pierce wrote:
> The only problem there is I don't have another working Coco. I have to
> trashed ones, but no working on. The whole setup worked for about an hour,
> then it started failing... the drives would start to boot OS9... then
> fail. No they won't even start. And it's the exact same for both drives.
> What's the likelyhood of 2 drives creating the same problems at the same
> moment. The Coco "seems" to be working ok... I can type in short basc
> programs and run them... as long as I don't use the "i" key. At this point
> I'm thinking of completely removing the Disto 2meg and the AT keyboard
> interface. Anyone know if there's anything I need to "put back" when I
> remove the disto? I know the 512k upgrade had a jumper that had to be
> clipped. I have 2 standard 512k boards, so I can at least put one of those
> in there. This would take out the disto as suspect.
> 
> 
> Bill Pierce
> ooogalapasooo at aol.com
> 
> 
> 
> 
> -----Original Message-----
> From: Robert Gault <robert.gault at att.net>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Fri, Dec 30, 2011 1:25 pm
> Subject: Re: [Coco] (no subject)
> 
> 
> Bill Pierce wrote:
> 
>  Here's one for the techies...
> 
> ><snip>
> 
> You did not try swapping the new Coco3 with an old one. If you know you
> have a ood Coco3, that would be a good test. Many strange things happen if
> the GIME ocket is corroded or contacts are bad. Likewise with ICs.
> Looks like you don't have any known good drives to test. I'd suggest
> opening one of the new drives and make sure the LED for the disk hole is
> not loose or other echanical problems are not visible. Check the RPM with
> the strobe pattern. ost certainly check the flat ribbon cable for the disk
> drives for continuity. I've no idea what a bad AT keyboard interface might
> do but swapping the Coco3 ould pin that down.
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> 
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The first thought that came to me upon reading your post is maybe the 
read/write head on the drive went bad from sitting.