Path: utzoo!attcan!uunet!uvm-gen!pegram
From: pegram@uvm-gen.UUCP (pegram r)
Newsgroups: comp.sys.atari.st
Subject: Re: Floppy drive 1.44 meg woes!
Message-ID: <1393@uvm-gen.UUCP>
Date: 14 Feb 90 17:51:17 GMT
References: <2103@ultb.isc.rit.edu>
Sender: nobody@uvm-gen.UUCP
Organization: EMBA Computer Facility, Univ. of Vermont, Burlington.
Lines: 31

From article <2103@ultb.isc.rit.edu>, by clf3678@ultb.isc.rit.edu (C.L. Freemesser):

>>  I'm haveing a few problems hooking up my 1.44 meg teac. I was wondering

>  From what I know, you can't use HD on the ST.  The controller chip
> can't handle it.  Just be glad it works in 720k mode.  :^)
> 
> Chris Freemesser, Rochester Institute of Technology :BITNET:%clf3678@RITVAX
>     |||        ____________                         :GEnie: C.FREEMESSER
>     |||       /___    /          (and 8-bit too!)   :USENET: clf3678@rit.isc
>    / | \   ______/   /                              :        .edu
> Call the A.C.O.R.N BBS (716)436-3078, 300/1200 baud :<-or my BBS

Not True, details of the modifications necessary were posted in this
group by the designer (I believe) in December 1989.

If I get enough requests (say 10 or more) I will repost the pertinent
bits (edited that is, to save BW, is that ok Hase?) Email requests (on
internet) to pegram@griffin.uvm-gen.uvm.edu

I make no guarantees, as I haven't had the time to do the mod myself
yet, but it does make sense.  The basic idea is to double the clock to
the 1772, then set your seek rate to "6msec" (= 3msec for a 16Mhz clock).
There are 1 or 2 gotchas that can come up (hey, it happens with 720K
drives too!) and you are clocking the WD1772 beyond its design limit
(10Mhz limit, 16Mhz actual).

Bob Pegram  (pegram@griffin.uvm.edu) Univ. of Vt., Burlington, Vt., U.S.A.

U.S. snail:
R.F.D. 2, Box 2843, Vergennes, Vt, O5491, U.S.A.