Re: [hatari-devel] Floppy disk reading fails if TT-RAM is enabled?

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 05/10/2019 à 02:52, Roger Burrows a écrit :
> On 5 Oct 2019 at 3:21, Eero Tamminen wrote:
> > With TOS v4, if I enable TT-RAM, TOS claims that the the data on
> > the attached disk may be damaged.  Disk works fine with TOS v4
> > when TT-RAM is NOT enabled, or if I use TT-RAM with TOS v3.
> >
> > This happens also with Hatari v 2.0, so it's not a regression.
> >
> > Dialog about damaged disk comes up when running the program
> > from the disk (initially it's autostarted by INF file).
> >
> > Any ideas why this might happen?
> Obviously you know that real Falcons don't have TT-RAM.  I don't suppose that
> Atari ever ran it with TT-RAM, so I'm not surprised if there are strange
> messages.  Or am I missing something?

No, that's certainly the problem ; trying to do FDC access to 32 bit TT 
RAM is not supported I think. Tos 3 is different, because TT's TOS was 
really meant to handle 32 bit addresses for RAM.