[Coco] CoCo Model 1 Cartridge Port

[Alex Evans]

The coco recognizes the track 0 sensor line. It should not be banging the
head. It should step to track 0 and know then that it is on track 0.


On Fri, Dec 24, 2021 at 11:02 AM Rick Ulland <rickulland1 at gmail.com> wrote:

>
> On 12/24/21 8:48 AM, Charles Hudson wrote:
> > Following your advice I moved the cable to the last connector (on the
> > end with two connectors) and repeated the process of "dksini0".  This
> > time the drive light came on and I could hear the stepper motor move
> > the head.  I failed to count the steps - I was completely surprised -
> > but a dozen steps or more activity ceased and the light went out.  The
> > result on the screen once again stated IO ERROR.
> >
> > I then tried repeating the disk format.  This time I heard the
> > mechanism straining; no regular repeated stepping and after a few
> > steps with long pauses between them the activity ceased and I got
> > another IO ERROR message.
> >
> I'd bet dollars to donuts Art is correct. The way a CoCo drive is
> supposed to work, you turn it own. The head position is unknown. First
> operation steps the head a whole buncha times, to make sure it's banged
> against the end stop for a while. DECB still doesn't know the head
> position, but assumes surely this is 0 and counts from here until death.
> If the head doesn't move, or doesn't move properly, DECB doesn't know
> and forges ahead until there is a read error.
>
> Pop the top, watch the show. Bring hair clipper oil for the dry slide
> rails. And Merry Christmas.
>
> -ricku
>
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