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From: ftw@datacube.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: How do I connect a 5.25 " floppy dr
Message-ID: <105100007@datacube>
Date: Thu, 11-Jun-87 21:30:00 EDT
Article-I.D.: datacube.105100007
Posted: Thu Jun 11 21:30:00 1987
Date-Received: Mon, 15-Jun-87 05:45:46 EDT
References: <2859@zen.berkeley.edu>
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Nf-ID: #R:zen.berkeley.edu:-285900:datacube:105100007:000:1243
Nf-From: datacube.UUCP!ftw    Jun 11 21:30:00 1987


I have tried hooking a Tandon TM-100 to my ST with some success, although
I haven't played with it much lately.  Here's a brief synopsis of what I did:

1.	Trash the 300 ohm terminator and replace it with a 1K ohm part.
	The 300 ohm pull up is too much for the low current driver in
	the ST.  Also look out for soldered-in 300 ohm resistors on the
	drive logic; take your handy VOM or DVM and check between the +5v
	pin on the power connector and the even pins on the edge connector
	on the drive.
	
2.	Make sure you have the drive jumpered as a drive 0.  The ST
	daisy-chains the select lines so every drive in line needs to
	be "drive 0".

This was 90% of my troubles.  The other 10% were evenly divided between not
having a proper format utility, and not having the correct info to slow
the seek rate.  I got around the former problem by formatting on a handy
PC/AT, and the latter by ignoring it (for the purposes of experimenting;
I don't run the Tandon much at all).  Both missing pieces are in the
public domain, to the best of my knowledge.  There are PD format utilities,
and not too long ago I saw someone discussing the correct memory locations
to change to slow down the seek rate.

Hope all this helps.  Good luck!

		-- Farrell