Yes, I've considered that, but . . . there's a delay involved that wouldn't
work with WD's chips unless you accumulate the pulses and disable ready.
Then mask the delays by extending the head-load delay. Remember, every
drive is different.
Dick
-----Original Message-----
From: Allison J Parent <allisonp_at_world.std.com>
To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
Date: Friday, February 04, 2000 6:12 PM
Subject: Re: WD1770 help needed
>"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 - 21:09:03 GMT