Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!wuarchive!texbell!attctc!pollux!bjc
From: bjc@pollux.UUCP (Betty J. Clay)
Newsgroups: comp.sys.amiga
Subject: Re: Are there any programs that allow reading Apple ][ disks?
Keywords: disk encoding, MFM, GCR, 13-sector, 16-sector, ProDOS, 5.25, 3.5
Message-ID: <15704@pollux.UUCP>
Date: 15 Aug 89 15:43:45 GMT
References: <495@tardis.Tymnet.COM>
Reply-To: bjc@pollux.UUCP ()
Organization: Department of Electrical Engineering; S.M.U.; Dallas, TX, 75275
Lines: 31

In article <495@tardis.Tymnet.COM> jms@tardis.Tymnet.COM (Joe Smith) writes:
>
>I haven't come across any other programs (commercial or PD) that read/write
>disks for the Apple2.  I can understand one obstacle - Apple uses GCR while
>everybody else uses MFM encoding.  (I have not yet determined whether the
>Amiga hardware is flexible enough to allow the software to do GCR or not.)
>
>Joe Smith (408)922-6220 | SMTP: JMS@F74.TYMNET.COM or jms@tymix.tymnet.com


The Amiga has a GCR lookup table built in.  In fact, you can use GCR if
you prefer, but it only works half as fast as the MFM encoding.  
The RKM states that the GCR capability in the Amiga is the Apple version.


The Amiga is already reading and writing disks using GCR for Central Coast
Software product Disk-2-Disk.  You see, all of the Commodore drives prior
to the Amiga used a form of GCR as well, and Disk-2-Disk can read and
write the Commodore 8-bit format, translating PETSCII to ASCII at the 
same time.  The program can move program files as well as text files, and
do it in either direction.


Betty

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Betty Clay
........texbell!pollux!bjc
CompuServe      76702,337

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