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On 21 Nov 2014 at 18:54, Thomas Huth wrote:
> Am Fri, 21 Nov 2014 12:03:05 -0500
> schrieb "Roger Burrows" <rfburrows@xxxxxxxxx>:
> > >
> > I started off needing to fix an EmuTOS bug which shows up when
> > running with Hatari 1.8.0. However EmuTOS under 1.8.0 does not
> > recognise ACSI disks due to (I believe) a bug in ACSI handling which
> > (I suspect) is fixed in the current repository (the bug is related to
> > accessing both 8604 & 8606 with the same instruction). If the fix is
> > indeed in the current repository, then I don't need to post a bug
> > report.
>
> I indeed fixed a related problem some weeks ago:
>
> http://hg.tuxfamily.org/mercurialroot/hatari/hatari/log?rev=d910217ea576
>
> But that only affected buggy ACSI drivers. So if EmuTOS did not work
> with 1.8.0, but now works again, it certainly does something wrong ;-)
>
EmuTOS carefully follows the rules in the "Atari ACSI/DMA Integration Guide":
on p.14, it explains what the driver needs to do to avoid the "DMA CHIP
ANOMALY". I suspect that the changes in 1.8.0 broke this, and the subsequent
change fixed it again. But until I can get a current version of Hatari to
work, I have no way of testing this ...
Roger
P.S. If you need it, the document referenced is at:
http://dev-docs.atariforge.org/files/ACSI_DMA_Guide_6-28-1991.pdf