[BBC-Micro] Fw: DD & HD Floppies

J.G.Harston jgh at mdfs.net
Sun Oct 17 13:44:33 BST 2010

Dave Curran wrote:
> Silly question, but I'm just taking a step back from this and thinking that
> instead of adapting HD disks to work in DD drives, what are the chances of
> getting standard 1.44M HD drives to work on the BBC?

Standard 1.44 HD drives *DO* work with BBCs, it's the *DISK* that's
different, that's why there's a hole/nohole on the disk. The hole
tells the drive what write current to use, and the computer sends
data at either 250KHz or 500KHz.

> The ideal would be adapting one of the DFS's to work with 1.44M disks -

See all the work Beardo has done with HD disk access. It is *very*
difficult on a BBC due to the incredibly tight access loops to
get the data transfered fast enough, and needs customised hardware
and rewritten firmware. See
and the thread starting here back in 2005:

J.G.Harston - jgh at mdfs.net

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