[Coco] CoCo 1 troubles

Arthur Flexser flexser at fiu.edu
Tue Dec 22 00:22:54 EST 2020

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..


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> escribió:
>  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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