[Coco] Issues with 26-3022 interface

Arthur Flexser flexser at fiu.edu
Tue Feb 12 00:04:41 EST 2013

My first step for anything drive-related is to make sure the contacts
on the edge connector are free of oxidation.  A pencil eraser, applied
until the contacts are shiny, works nicely.

Are you sure that the disk you are using is double-density, not a HD
one?  And that it is not write-protected?

If you have an already-formatted CoCo disk available, see if it can be
read.  If the drive can read and save to an already-formatted disk but
can't format a new disk, that would make it look like there was a
problem with index-hole detection, which on the CoCo is only used in


On Mon, Feb 11, 2013 at 10:00 PM, Daniel Campos <daniel.campus at gmail.com> wrote:
> Hello,
> I just acquired from ebay a 26-3022Tandy interface, but I'm having a bad
> time to make it work with a DSDD drive that I just extracted from my CP500
> (TRS-80 model III brazilian clone). For what I know, the drives from CP500
> have the same configurations as a TRS-80 original drive. The drive work like
> a charm on the CP500.
> I made a brief movie showing the error and the functioning of the drive (my
> apologies, but the movie is in portuguese).
> http://www.youtube.com/watch?v=oeiCJYa3jic
> Any hints on what I need to look at on a TRS-80 drive to work with the Coco
> ?
> Just out of curiosity I tested a 5 1/4 HD (1.2M) Drive from an old PC and I
> could make a DSKINI (even with an IO ERROR at the end) and also a SAVE and a
> LOAD on a BASIC program, so it appears that the interface is working as it
> should.
> I also take note on several sites that a mod for HD drives is around for
> this interface. Anyone knows where to find a documentation of this mod ?
> Thanks!
> Daniel
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