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From: p554mve@mpirbn.mpifr-bonn.mpg.de (Michael van Elst)
Newsgroups: comp.sys.amiga.hardware,comp.sys.amiga.programmer
Subject: Re: Decoding MFM
Message-ID: <1480@mpirbn.mpifr-bonn.mpg.de>
Date: 29 Jan 91 14:27:45 GMT
References: <2786@gould.doc.ic.ac.uk> <18157@cbmvax.commodore.com>
Reply-To: p554mve@mpirbn.UUCP (Michael van Elst)
Organization: Max-Planck-Institut fuer Radioastronomie, Bonn
Lines: 13

In article <18157@cbmvax.commodore.com> jesup@cbmvax.commodore.com (Randell Jesup) writes:
>	Decode is easy.  take the two halves of the longword, and each of
>them with $55555555, shift the even bits 1 left, and or them together.

That's true for the Amiga version of MFM. Plain IBM compatible controllers
(that use MFM as well) use a different scheme.

Regards,
-- 
Michael van Elst
UUCP:     universe!local-cluster!milky-way!sol!earth!uunet!unido!mpirbn!p554mve
Internet: p554mve@mpirbn.mpifr-bonn.mpg.de
                                "A potential Snark may lurk in every tree."