Re: [hatari-devel] EmuTOS / Vertical Mayhem regresssion

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Vertical Mayerm runs well with latest hatari, real TOS 4.02fr.

I think your problem is that you don't run hatari new core with cycle exact.
Doesn't a0 points on the DSP registers ?
In this case, it'a because VM is timing sensitive, and you must test 
with my cycle exact CPU.

regards

Laurent


Le 26/02/2012 21:45, Eero Tamminen a écrit :
> Hi,
>
> On sunnuntai 19 helmikuu 2012, Eero Tamminen wrote:
> > On lauantai 18 helmikuu 2012, Eero Tamminen wrote:
> > > Btw. There's something funny with non-DSP Falcon emulation
> > > in regards to EmuTOS.
> > >
> > > Virtual Mayhem game doesn't work with EmuTOS with latest
> > > Hatari, but with Hatari v1.4, it works fine also for EmuTOS.
> > >
> > > This was one of the first Falcon games ever to work with Hatari,
> > > so it's not picky about the emulation accuracy and it doesn't
> > > use DSP...
> > Seems EmuTOS is now setting _SND bits for things it doesn't
> > actually support.  Not an Hatari issue.
> FYI: Not _SND issue after all as it doesn't seem to care about
> the bits, but calls the non-implemented EmuTOS OS functions
> regardless of them.
>
> This one's wierd as with the same game and EmuTOS version the game
> starts fine when using Hatari v1.4.
>
> GEMDOS HD emu doesn't affect it because the same issue happens
> also from HD image.
>
> With Hatari CPU profiling I can see that the code is
> spending all it's time in this loop:
> $04b78c : 0148 0000                            movep.l   0(a0),d0
> $04b790 : 4e71                                 nop
> ...
> $04b7ac : 4e71                                 nop
> $04b7ae : 0348 0000                            movep.l   0(a0),d1
> $04b7b2 : e088                                 lsr.l     #8,d0
> $04b7b4 : e089                                 lsr.l     #8,d1
> $04b7b6 : b280                                 cmp.l     d0,d1
> $04b7b8 : 66d2                                 bne.s     $4b78c
>
>
> Vertical Mayhem calls following OS functions which aren't
> supported by EmuTOS:
> > XBIOS 89 (VgetMonitor)
> > XBIOS 133 (Settracks)
> > XBIOS 134 (Setmontracks)
> > XBIOS 139 (Devconnect)
> But I don't understand why Hatari version affects what happens
> as result, the Hatari options were same.
>
>
> Any comments on that?
>
>
> 	- Eero