Open-source floppy reader: the data separator/sync-er works!
cc at corti-net.de
Fri Apr 13 04:01:44 CDT 2007
On Thu, 12 Apr 2007, dwight elvey wrote:
> In FM there is always a clock bit and a location for the data bit. Missing
> clock is just that, missing clock! No change to the data bits.
> MFM may or may not have a clock, depending on the data 1 bit density.
> If missing a clock, it means where a clock bit should be related to data.
I know what clock bits are ;-)
The question was, why three missing clock bits (the MFM address mark has
only one missing bit at position 5). But I've found out that this applies
to the FM address mark where the clock bits 2, 3 and 4 are missing. The
IBM manual just wasn't precise enough on this point.
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