Re: [hatari-devel] Spec512 screens with higher CPU frequencies

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 02/03/2019 à 08:17, Thomas Huth a écrit :
>   Hi all,
>
> The author of the game "Alpha Waves" reported an issue on github when
> running the game in 2-player mode with 32 MHz:
>
>   https://github.com/hatari/hatari/pull/2/commits/c7711fbae26295ddd288
>
> The suggested fix apparently fixes the graphical glitch in the game,
> but currently I wonder: Does it make sense at all that we run the
> spec512 with CPU frequencies > 8 MHz? The Spec512 code has definitely
> only been written with 8 MHz in mind, so I think we should rather not
> use these screen convert functions if the user selected a CPU frequency
> of 16 MHz of 32 MHz. Other opinions / ideas?

Hi

I need to look at this patch, because some times ago I fixed some color 
timing to be able to run at other freq like 16 or 32 MHz and keep the 
color aligned when doing plasma like effects.

I don't think this should be limited to 8 MHz only, as someone could 
write a demo for a 16 MHz megaste for example and on real HW you would 
be able to align colors, which would not work anymore if we limit the 
spec512 code to 8 MHz.

Nicolas