8" drive on PC troubleshooting

[Tom Jennings]

On Mon, 28 Feb 2005, Vintage Computer Festival wrote:

> If I then try to DIR the disk the head backs up a track or so but can't
> seem to recalibrate to track 0.  The head vibrates as if the drive is
> sending the signals to the stepper to retract the head but it only manages
> to move back a track or so each time I issue DIR.  If I do it enough it
> eventually gets back to the stop position but it still gets sector errors.

Wrong step rate! Poke a new on eint othe chip, or does it use the old
table of junk INT 13h used to supoprt?