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Old 25 August 2017, 21:40   #1
mark_k
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Utillity to decode MFM data

I'm looking for a program which can decode MFM-encoded data (e.g. raw track data read from a floppy disk). Is there anything like that for the Amiga? Maybe on some old utility compilation???
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Old 25 August 2017, 23:24   #2
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I'm looking for a program which can decode MFM-encoded data (e.g. raw track data read from a floppy disk). Is there anything like that for the Amiga? Maybe on some old utility compilation???
Hi mark_k, there is various tracks loaders available with simple asm code.
(i've written some related code the last month)

Or you need C source?

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Old 26 August 2017, 01:06   #3
kamelito
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IIRC Raw copy does that.
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Old 26 August 2017, 01:58   #4
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Originally Posted by mark_k View Post
I'm looking for a program which can decode MFM-encoded data (e.g. raw track data read from a floppy disk). Is there anything like that for the Amiga? Maybe on some old utility compilation???
Rawdic does, you have to pass decode parameters to it, its what every WHDload patcher uses to decode original disks.
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Old 26 August 2017, 14:28   #5
Wepl
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no sure what you search, but the wwarp package (http://whdload.de/whdload/WWarp128.lha) contains a mfm tool (with src) which calcs from from two longs (odd/even) the decoded value.
for larger chunks of data decoding depends on the organization of the data: odd first or even first and odd/first alternating or separated which is different for various disk formats
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Old 26 August 2017, 15:32   #6
ross
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The MFM format is really simple but you need to sync somehow. Decoding data without knowing internals is relatively useless. If you format is unknown (or know but alien), and none of the available tools recognize it, you need to write your own.
And you need to study some source

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