[Coco] CoCo 1 troubles

Arthur Flexser flexser at fiu.edu
Wed Dec 23 20:08:07 EST 2020

If the drive is regarded as Drive 1 as you have it currently connected, it
seems like it should be regarded as Drive 0 if you plug it into the other
drive connector on the cable.


On Wed, Dec 23, 2020 at 7:11 PM Salvador Garcia via Coco <
coco at maltedmedia.com> wrote:

>  Thanks again, much appreciated!
> I see the socket. It is populated. It looks like a white IC, stamped
> "Beckman". Most certainly that's the resistor pack.
> Nope, DSKINI 1 it is. Trying to access drive 0 does nothing, only the
> motors spin up then the IO ERROR.
> DSKINI 1 starts the formatting process and after stepping 34 times and
> doing a seek, I get IO ERROR.
> Yes, looking straight into the drive connector I see some dark areas.
> That's probably where the pins are missing.
> I can not access files on an already formatted diskette
> Salvador
>     El miércoles, 23 de diciembre de 2020 04:29:14 p. m. CST, Arthur
> Flexser <flexser at fiu.edu> escribió:
>  On some systems, especially those Tandy initially sold for the CoCo 1,
> drive selection is done by having pulled pins on the different cable
> connectors, rather than by jumpers within the drives.  If you look at the
> cable connectors end-on, you should see different pins pulled on the
> different connectors.  You should still have a terminating resistor in the
> last drive in line.  Is there a prominent empty socket within the disk
> drive that looks like a resistor might go there?
> Do you mean DSKINI1, not DSKINI0?  Ordinarily, with just one drive, that
> one would be Drive 0.  That DSKINI gets through 34 steps and then bombs
> means that correct formatting did not take place, in that DSKINI has gone
> back to Track 0 and begun its verify pass, trying without success to read
> from the just-formatted tracks
> Can you access files on an existing, already formatted disk with data on
> it?
> Art
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