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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!houxm!vax135!cornell!uw-beaver!uw-june!entropy!dataio!pilchuck!kenk
From: kenk@pilchuckDataio.UUCP (Ken Koster)
Newsgroups: net.micro.amiga
Subject: Re: Using 96tpi 5-1/4 drives on Amiga
Message-ID: <199@pilchuckDataio.UUCP>
Date: Wed, 8-Jan-86 12:06:30 EST
Article-I.D.: pilchuck.199
Posted: Wed Jan  8 12:06:30 1986
Date-Received: Fri, 10-Jan-86 07:34:35 EST
References: <423@bcsaic.UUCP>
Organization: Data I/O Corp., Redmond WA
Lines: 23

> Granted the 3-1/2 drives would be better to have.  But with 96tpi 5-1/4
> drives multiplying like rabbits and diving in price, the thought naturally
> occurs - what problems would I encounter?  Has anyone else attempted this?
> ===========================================================================
> randy groves
> ...!uw-beaver!uw-june!bcsaic!randy

   Yes. 
   The expansion connector on the Amiga allows you to connect up to three
additional external drives. However, as has been previously mentioned on 
the net, Commodore has used a non standard arrangement for motor control.

   I have a circuit that allows two external drives (96tpi 5-1/4,3-1/2 ) 
to be connected and will post it to the net within the next few days. The
circuit provides a common motor control as well as disk change detection
if your 5-1/4 drive has a 'held ready' option. I am currently using this
arrangement with two Mitsubishi 4853 drives and it seems two work very well.

   The circuit is quite simple and will be posted as a 'Net List' of pin
connection's unless someone has a better idea. 

 Ken Koster
 --------->  uw-beaver!teltone!dataio!pilchuck!kenk