14 Jan
2011
14 Jan
'11
12:59 p.m.
On 14 Jan 2011 at 19:06, Tony Duell wrote:
This is actuall older than one might think. I've got a FH 5.25"
Micropolis 96 tpi drive that uses buffered seek--it blocks index
until the head is on-cylinder. Probably 1979 or so; I could check
the date codes. It uses a MOS Technology microcontroller (house
numbered). It has a HC51/U-sized 2MHz crystal on the PCB.
Cheers,
Chuck
seems that
instead of requiring a particular time between step
pulses, these drives allow the controller to step as fast as it
likes and they
What happens with one of these drives is you slow the steppign rate
(at the cotnroller) right down, say to 20ms steps? Does it still
sometimes kil the index pulse?