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From: cmcmanis@pepper.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Reading MacDisks on Amiga
Message-ID: <19304@sun.uucp>
Date: Wed, 20-May-87 01:15:37 EDT
Article-I.D.: sun.19304
Posted: Wed May 20 01:15:37 1987
Date-Received: Thu, 21-May-87 05:08:59 EDT
References: <8705191949.AA17002@cory.Berkeley.EDU>
Sender: news@sun.uucp
Reply-To: cmcmanis@sun.UUCP (Chuck McManis)
Organization: Sun Microsystems, Mountain View
Lines: 23

In article <8705191949.AA17002@cory.Berkeley.EDU> (Matt Dillon) writes:
$>According to the DOS 3.3 Technical Reference Manual (which IBM sent to me for
$>some unknown reason) the two 'formats' for 3.5" media are as follows:
$>
$>	Sides		Sectors/Track	Media Descriptor
$>	  2		      9		      F9H
$>	  2		     18		      F0H
$
$	This isn't necessarily physical.  It could be a logical mapping so
$software doesn't break. 
$
$			-Matt

But it is physical. Double the clock, double the sectors (or double the
size of the sectors). With the above note I am *sure* that IBM left the
AT type floppy controller intact and switch the data clock between
250 and 500 kilohertz. (I know dead horse, I'll stop now.)



--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
These opinions are my own and no one elses, but you knew that didn't you.