Re: [hatari-devel] UFO STe demo

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

On 21/10/2013 23:23, Eero Tamminen wrote:
> Hi,
>
> 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...
>
>
> 	- Eero

Hi

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.

Nicolas