[Coco] Had again

[L. Curtis Boyle]

Years ago, I had problems with a Coco 1 using a disk drive, and it was the 6809 in that case that caused the problem (the controller/drive itself was fine).

L. Curtis Boyle
curtisboyle at sasktel.net



On Jun 22, 2013, at 5:38 PM, Bill wrote:

> Yeah, I've learned that the first thing I do when I get anything with edge
> connectors is to "erase" them. Makes no difference. I actually suspect the
> Coco1 (it is in NO WAY virgin). I'm gonna open it up again and check to see
> if the chips are all set properly.
> 
> BTW, what would happen if I took chips out of the trashed Coco2 and put them
> in the Coco1? 
> 
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
> Behalf Of Arthur Flexser
> Sent: Saturday, June 22, 2013 5:00 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] Had again
> 
> 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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