Re: Floppy disks on 520ST

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Article #2889

#2889

From: Jangling Neck Nipper
Date: Sun, 06 Aug 1989 14:53

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In article <CMM.0.88.618299761.f-leoe@kyrre.uio.no> f-leoe@IFI.UIO.NO (Lars-Erik 0sterud) writes:

   TOS 1.4 formated disk will work all right on IBM...
   I small change in the format or boot-sector i think....

I've no idea about 1.4, but I've noticed that the version of TOS I'm
running creates FAT tables with a media descriptor of 0xF7, and uses a
512 byte cluster size, 5 block FAT tables, root 11..17, data 18..1439
(for double sided).  Now PC's won't recognise this, but if you format
a 3.5" disk on a PC, you get descriptor 0xF9, and the ST *will* access
these correctly.  So the answer for anyone wishing to maintain
compatability in TOS < 1.4 would be to create the file systems on the
PC.  Of course it's a simple matter to write a program to create an
0xF9 file system anyway.

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!mcvax!ukc!acorn!moncam!harry
From: harry@moncam.co.uk (Jangling Neck Nipper)
Newsgroups: comp.sys.atari.st
Subject: Re: Floppy disks on 520ST
Message-ID: <HARRY.89Aug6155328@marvin.moncam.co.uk>
Date: 6 Aug 89 14:53:28 GMT
References: <CMM.0.88.618299761.f-leoe@kyrre.uio.no>
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Organization: Monotype ADG, Cambridge, UK.
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In-reply-to: f-leoe@IFI.UIO.NO's message of 5 Aug 89 05:55:41 GMT

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