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From: scotty@l5comp.UUCP (Scott Turner)
Newsgroups: comp.sys.amiga,comp.sys.mac
Subject: Re: Reading MacDisks on Amiga
Message-ID: <138@l5comp.UUCP>
Date: Fri, 22-May-87 08:10:56 EDT
Article-I.D.: l5comp.138
Posted: Fri May 22 08:10:56 1987
Date-Received: Sat, 23-May-87 19:45:24 EDT
References: <8705080543.AA18112@cory.Berkeley.EDU>
Reply-To: scotty@l5comp.UUCP (Scott Turner)
Distribution: world
Organization: L5 Computing, Edmonds, WA
Lines: 23
Summary: Must be double data rate, and news on those pesky mac disks.
Xref: mnetor comp.sys.amiga:5116 comp.sys.mac:3416

Since Apple just doubled the clock rate available to the disk section of the
new Macs, with the stated purpose of being ready for the new 1.4 meg drives,
it would seem most likely that the doubling in storage capacity is coming from
a higher data rate rather then twice as many tracks.

On the "it can't be done" front. I received a phone call last night from one
of the groups working on reading mac disks on the Amiga. They claim they can
read 4/5ths of the Mac disk with VERY LITTLE TROUBLE. Reading the last 1/5th
does present some what more of a challenge but they claim they can handle it.

The greatest obstacle still left is how to calculate the 24 bit CRC used on
the Mac disks. No dox have been found at present describing the polynomial
used. Can anyone out there help? Drop me an E-Mail and I'll pass the info
along.

[So much for "FOG" :)]

Scott Turner

-- 
L5 Computing, the home of Merlin, Arthur, Excalibur and the CRAM.
GEnie: JST | UUCP: stride!l5comp!scotty | 12311 Maplewood Ave; Edmonds WA 98020
If Motorola had wanted us to use BPTR's they'd have built in shifts on A regs
[ BCPL? Just say *NO*! ] (I don't smoke, send flames to /dev/null)