WD1793 read-track weirdness

From: Vintage Computer Festival <vcf_at_siconic.com>
Date: Fri Mar 26 01:31:29 2004

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
International Man of Intrigue and Danger                http://www.vintage.org
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Received on Fri Mar 26 2004 - 01:31:29 GMT

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