Path: utzoo!yunexus!ists!jarvis.csri.toronto.edu!mailrus!uunet!cs.utexas.edu!think!snorkelwacker!bloom-beacon!eru!luth!sunic!mcsun!unido!tub!tmpmbx!netmbx!hase
From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: Atari TT Block Diagram
Message-ID: <3779@netmbx.UUCP>
Date: 18 Nov 89 15:54:53 GMT
Article-I.D.: netmbx.3779
References: <8911150802.AA02649@ucbvax.Berkeley.EDU> <10132@stag.math.lsa.umich.edu>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin, West Germany
Lines: 28

In article <10132@stag.math.lsa.umich.edu> hyc@math.lsa.umich.edu (Howard Chu) writes:
>Ah-hah! So, the WD1772/2793 is the magic part number, eh? What'll it
>take to put one of these in an ST for 1.4MB floppy capability? Does
>anyone here have access to Western Digital folks for pinouts & other
>specs for this chip? 

Well, You want to have an 1.44 Meg drive for the ST?

It's really easy: just switch the clock frequency of the WD1772 to 16
MHz (taken from the shifter) and attach a high density drive (like the
TEAC FD 235 HFN).

Set the seekrate for the drive to 6 Milliseconds (will become 3 with the
doubled clock).

Format high density disks with my little formatter (posted here).

A high density 5.25 inch drive is possible too. But these have no
automatic HD-recognition...

Works well for me.

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
Dennis had stepped up into the top seat whet its founder had died of a
lethal overdose of brick wall, taken while under the influence of a
Ferrari and a bottle of tequila. (Douglas Adams; the long dark teatime...)