[Coco] Coco 2b problem: reboots when accessing the disk

[Retro Canada]

it's not a reboot per se seems the SAM goes crazy, relay clicks and screen gets garbled as if in double speed. sometimes is only flashing with characters on screen. but only when reading or writing from floppy. and i dont have a multipak to test.
but from superide everything works, games, Os-9 etc




Sent from my iPhone

On 2013-02-26, at 12:31 AM, Mark McDougall <msmcdoug at iinet.net.au> wrote:

> On 26/02/2013 4:26 PM, Arthur Flexser wrote:
> 
>> I think I had something like that years ago that turned out to be due to a
>> flaky 6809.  You might try seeing if the problem persists when you swap
>> in the 6809 from your CoCo 3.
> 
> That's a rather unscientific approach to the problem. But hey, you never
> know...
> 
>>> This problem doesn't happen with the superIDE. I measured the voltage (with
>>> a multimeter) and I didn't see any voltage drop (+5v).
> 
> If you have a transient drop when the drive is first accessed, then you
> won't see it with a multimeter.
> 
> I can't offer a solution but I suspect you'll need more comprehensive
> diagnostic tools. I'd persist with the cap replacement if all else fails,
> because it does sound like a power surge (supply) issue.
> 
> Regards,
> 
> -- 
> |              Mark McDougall                | "Electrical Engineers do it
> |  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"
> 
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