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From: turner@daisy.UUCP (D'arc Angel)
Newsgroups: comp.sys.atari.st
Subject: Re: RE: RE: PC-Ditto and IBM Boot disks
Message-ID: <513@daisy.UUCP>
Date: Mon, 14-Sep-87 11:42:17 EDT
Article-I.D.: daisy.513
Posted: Mon Sep 14 11:42:17 1987
Date-Received: Thu, 17-Sep-87 02:38:57 EDT
References: <[E.ISI.EDU]10-Sep-87.08:56:33.TAC.354TFW-SIX>
Organization: The Houses of the Holy
Lines: 25

> 
> Also, (Jim) if anyone has the schematic for connecting a regular
> IBM style 5 1/4 disk to the ST, PLEASE!  post it.
> 
> Again, thanks for the help!
> 
> Dennis Scott
> 
> (803)238-6037

I worked from an article that was published in Analog a few years ago (or
maybe it just seems that long) on how to hook a 5 1/4" drive to a 3 1/4"
(it can only be the B disk). The article had 1 serious omission, the 
ST uses cmos level signals while most disk drives use TTL level. The
result is that the signals are too weak (from ST) to reach the disk
drive. The solution was to grap an off-the-shelf buffer chip, run power
to it from the A drive, and buffer all of the signals from the ST to the
drive. I don't believe that we did anything to the signals going from
the drive to the ST (actually the A drive, but why get pickey). If you
can't find the article send me email and i will see if i can dig it up.
-- 
C'est la vie, C'est la guerre, C'est la pomme de terre
{cbosgd,fortune,hplabs,seismo!ihnp4,ucbvax}!nsc!daisy!turner      Jim Turner 
Daisy Systems, 700 E. Middlefield Rd, P.O. Box 7006, 
Mountain View CA 94039-7006.                                   (415)960-0123