Software-based floppy disc data separator
cclist at sydex.com
Wed Jun 16 22:00:20 CDT 2010
Sigh. There are times when I'd be happy to get one disk an hour.
Finally solved (I think) the mystery of the "slipping belt". It's
not that. The data of every sector on the track looks to be correct,
but all of the *data* CRCs are foobar. The CRC for the IDAMs is
fine. Screwball firmware? Just a couple of tracks like this, but
they all have goofy data CRCs on every sector. The histograms of the
read pulses from those sectors shows no aberrations--3 nice clean
peaks, about where you'd expect them.
Not an LSI controller of any sort, BTW.
In the middle of all of these things is a 32-hard-sector FM-encoded
floppy. I've got to figure out what the customer wants to do with
Most people don't realize how many formats there are once you get
outside of the "Personal Computer" arena. These are from a Fairchild
On to a batch of 240K Brother WP floppies (3.5" GCR).
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