5 Feb
2006
5 Feb
'06
2:34 p.m.
On 2/5/2006 at 9:35 PM Philip Pemberton wrote:
The CBM 1541. (in)famous for the *BANG* sound you got
when the head hit
the
end stop. Probably why they ended up going out of
alignment quite
quickly...
At least, I *think* it was the 1541. Same drive that had a stupidly
underrated power supply that tended to blow with the slightest
provocation.
Yeah, it was the 1541--and didn't the Apple ][ drives use the same
technique of "step into the stop until you're sure you've hit bottom"?
But then, some dot-matrix printers used the same technique for zeroing the
carriage. If you had the carriage powered by a DC servo instead of a
stepper, you could even monitor the motor current to see when you'd slammed
into the stop.
--Chuck