Re: [hatari-devel] UFO STe demo

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Hi,

On tiistai 22 lokakuu 2013, Nicolas Pomarède wrote:
> On 21/10/2013 23:23, Eero Tamminen wrote:
> > When I just tested the UFO STe demo:
> > 	http://www.pouet.net/prod.php?which=60831
> > 
> > I noticed something strange...
> > 
> > With TOS 1.62, it freezes at start without "--fastfdc off",
> > but with EmuTOS it works fine also with "--fastfdc on".
> > 
> > I didn't know that was TOS specific...
>
> yes, I can see this too ; I guess it's just a coincidence that it works
> with emutos and fastfdc. Certainly the demo uses some too tight timings,
> maybe depacking data as they're read and too fast fdc can mess with this.
> 
> The TOS' read sector xbios function must have slightly different timings
> compared to EmuTos' one, but I don't think there's anything to fix on
> the emulation's side.
> "Fastfdc on" is speeding delays by a x10 factor, hopefully it should
> work in most cases, but when it doesn't it just means the demo/game
> expect (sometimes not willingly) timings from real HW.

Ok, I'll just add a note about "--fastfdc off" to the compatibility list.


	- Eero



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