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

[ Thread Index | Date Index | More Archives ]

Le 02/03/2019 à 11:29, Nicolas Pomarède a écrit :
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:

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?


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.

I tried this game in 2 players mode t 32 MHz, but I don't see any glitches with colors. Do you know which part allow to see the problem ?


Mail converted by MHonArc 2.6.19+