3 Jul
2007
3 Jul
'07
4:49 p.m.
On 3 Jul 2007 at 20:57, Tony Duell wrote:
Is it old enough to be a stepper motor positioned?
Some of those do not
restroe to cylinder 0 at power-on, so the heads won't move unless told to
do so by the controller board. It's possible there's a problem with the
controller, therefore.
Stepper model, basically the Tandon version of the ST412. Bitsavers
has a users manual for the TM500 series and a maintenance manual for
the TM602, which might be pretty close. IIRC, these things were used
on some of the Tandy boxes.
Vanilla-plain 306 cylinder, 4 head, 1st generation buffered seek MFM
drive.
Cheers,
Chuck