Re: 9V AC needed for C64? and more......

From: Ojala Pasi 'Albert' (
Date: 1998-09-04 00:01:21

> MFM is the system used for encoding sector data on the disk. It uses
> five bits for every nybble

Read: MFM uses two disk bits for each data bit.
See -> C1581

Basically a 1-bit is added between bits if they both are 0,
otherwise a 0-bit is added. A pattern which can not occur
in validly encoded MFM ($4489) is used as a sync mark.

> the physical media, but since it uses a different directory and file
> structure the standard MS-DOS commands such as DIR and COPY can't

There's also the problem with 9 (PC) vs 10 (1581) sectors per
track (and perhaps different sector headers also).

"It's not justice you are after, Major, it's blood."
	-- Sinclair to Lianna Kemmer in Babylon 5:"Survivors"
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