[Coco] CoCo 1 troubles

L. Curtis Boyle curtisboyle at sasktel.net
Tue Dec 22 01:54:25 EST 2020

I have had that HALT problem too, and it was the CPU. At this time , you could replace it with a 6809 or 6309. 

Sent from my iPhone

> On Dec 21, 2020, at 11:23 PM, Arthur Flexser <flexser at fiu.edu> wrote:
> ´╗┐The inability to format a disk also suggests a possible 6809 problem,
> specifically with the HALT line.  For $6 or $8 bucks or so, you could order
> a new 6809E.  Worth the gamble, in my opinion, assuming you cannot borrow
> one from another computer or elsewhere.  (This is assuming the disk drive
> works correctly for functions other than formatting.)  If the HALT line is
> not working right, you should also see trouble when you try to read or save
> a very long file, or try to boot up OS9..
> Art
>> On Mon, Dec 21, 2020 at 11:24 PM Salvador Garcia via Coco <
>> coco at maltedmedia.com> wrote:
>> Thanks Art!
>> I am one step closer. I reseated all the socketed chips, I also
>> disconnected and reconnected the KB connector. I cleaned the edge
>> connectors on the disk controller cartridge.
>> This seems to have mitigated the problem with the keys. I still lose a
>> keystroke, but not as frequent. Thanks to Rietveld, I will soon have a
>> second KB to test.
>> Now, when I insert a diskette and try to format it, I get an IO error.
>> Sigh. Reading the user's guide for the disk system, I am now at the third
>> troubleshooting tip: Contact Radio Shack repair center. I think that is
>> easier said than done ;-). I also tried DIR, with same result.
>> Salvador
>>    El lunes, 21 de diciembre de 2020 09:19:48 p. m. CST, Arthur Flexser <
>> flexser at fiu.edu> escribi├│:
>> While you are reseating chips, it wouldn't hurt to do so with the 6809 and
>> the two PIAs.  If you have another CoCo, try swapping the 6809 in from the
>> other one, and see if it affects the problem.  (A CoCo 3's 68B09 will work
>> in a CoCo 1.)  I've seen 6809 flakiness do odd things.
>> Art
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