Re: [hatari-users] Floppy in Falcon mode

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

On 23/12/2011 21:56, Vincent Rivière wrote:
> Vincent Rivière wrote:
> > Oh, so there is a bug in EmuTOS floppy routines. Strangely, it works
> > fine with ARAnyM... It also works fine on Hatari with ST/TT hardware,
> > with any CPU/speed combination. But it fails on Hatari as soon as Falcon
> > hardware is selected.
>
> Finally:
>
> 1) It always worked fine with the B: drive. I made wrong tests.
>
> 2) About the A: problems, it was actually a timeout issue! On Hatari in
> Falcon mode, a Restore (goto track 0) command on A: takes about 2.5
> seconds, while in any other cases (including drive B: in Falcon mode !)
> it takes less than 1.5 seconds. So I will increase the EmuTOS timeout.
> Does this make sense ?

Hatari timings for FDC are now *very* accurate, a lot of improvements 
and testing with many cases (games' protection) were made.

Restoring to track 0 should take the same time for A: or B: ; do you use 
exactly the same fdc commands ? Do you wait for motor on in your fdc 
commands ? What stepping rate do you use ?

Even with a 12 ms stepping rate, restoring from track 79 should take a 
little less than 1 sec, so it all depends on the optional bits you use 
in the restore command.

Anyway, if fdc commands are the same for A: and B:, then it means floppy 
drive's heads were not on the same track when doing the restore command.

As for the timeout to use, 2.5-3 sec should be ok, but I don't see in 
what case you can reach the timeout, except on a disconnect or damaged 
floppy drive (or maybe if you set FDC's verify bit and track 0 is not 
formatted)


Nicolas