WD1770 help needed

From: Allison J Parent <allisonp_at_world.std.com>
Date: Fri Feb 4 18:57:46 2000

"In the case of the 1771 and 179x series it's possible to build a really ne
<circuit I've seen but never tried to match, which uses the /TEST pin on th
<
<Sounds like an ideal candidate for reimplementation in a single chip
<microcontroller.

Did that many years ago using 8748, worked very good too as I could count
the pulses then issue them out as a ramped rate so that the head was
accelerated and decelerated to the track. Didn't make any difference for
a few track move. Head movement that was about 15 tracks or more it was
very noticeable. CP/M does a lot of seek to the directory track (usually
track one or two) every time it writes an extent or closes/opens a file so
decreases in seek time payed nicely.

Allison
Received on Fri Feb 04 2000 - 18:57:46 GMT