25 Mar
2004
25 Mar
'04
8:31 p.m.
On Thu, 25 Mar 2004, Bill Yakowenko wrote:
Has anybody out there written drivers for the WD1793
floppy
disk controller chip? I've been doing that for fun, and have
hit on a very strange problem with the 'read track' command.
It seems to work just fine, returning a stream of bytes that
includes the data for each sector, until it finds a byte with
a value of $29 (or 29H, if you prefer). From that point up
to the next address mark, it gets garbled data. No other data
value seems to have any odd effect. 'Read sector' returns
the right data with no weirdness.
Are you sure it's not a matter of a bad sector on the disk?
--
Sellam Ismail Vintage Computer Festival
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