[Coco] Had again

[Arthur Flexser]

Assuming the controller's contracts (on both surfaces) are bright and
shiny, and that you'v e tried the pencil eraser cleaning method....

my next suspect would be the 6809.  Perhaps it is getting stuck in
HALT mode during DSKINI and memory is going too long without refresh??

Another possible suspect is bad index hole detection, which is only
used during DSKINI.  Though I wouldn't think that would cause a crash
of the sort you describe.

Art

Art


On Sat, Jun 22, 2013 at 6:40 PM, Bill <cwgordon at carolina.rr.com> wrote:
> Well, wouldn't ya , know it? I finally figured out how to get a couple of
> drives, and the one that costs the most, is the dud! It's a Radio Shack Mini
> Disk (unopened) with no label. The controller is a 26-3029 (also
> unopened-the seals are in place.)
>
>
>
> Attached to the Coco 1, I tried a couple of used disks in it, and it reads
> and writes without a problem. I put in a new unformatted disk, and type
> DSKINI0, and the light comes on, it clicks and whirrs a little, then nothing
> but "interference" on the TV screen. It doesn't even IO out.
>
>
>
> I'm hoping it's something very simple, but I don't know. Can't tell if it's
> the Coco, the controller, or the drive itself.
>
>
>
> Ideas?
>
>
>
> Thanks
>
>
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