Path: utzoo!attcan!uunet!lll-winken!lll-lcc!well!dsmall
From: dsmall@well.UUCP (David Small)
Newsgroups: comp.sys.amiga
Subject: Re: Magic Sac for Amiga (was Re: How 'Bout HyperCard!)
Keywords: HyperCard, Mac, Magic Sac, drive
Message-ID: <5984@well.UUCP>
Date: 18 May 88 03:51:44 GMT
References: <15372@uflorida.cis.ufl.EDU> <5965@well.UUCP> <2925@phoenix.Princeton.EDU>
Reply-To: dsmall@well.UUCP (David Small)
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 12


(The discussion was, can the Amy read Mac disks).
The Mac disks are recorded at five different speed ranges,
for tracks 00-0f,10-1f,20-2f,30-3f,40-4f. The innermost tracks'
data rate is the 4 microseconds per bit you expect under GCR; hence,
a byte comes off every 32 microsec (much like MFM, although of course that's
covering up MFM encoding & GCR denibbleizing).
The Amiga is looking for data at 4 usec/bit also.
  Towards the outer tracks (00), the data is at 3 microsec/bit.
The Amiga doesn't like to seperate and clock this in; I can't say I blame
it much. But anyway, my experience has been, the outer 32 tracks only
can be read.
  -- Thanks, Dave