Re: [hatari-devel] cfg (8 vs 16 Mhz)

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 07/12/2022 à 21:44, Thomas Huth a écrit :
> Am Wed, 7 Dec 2022 21:02:47 +0100
> schrieb Christian Zietz <czietz@xxxxxxx>:
>
> > Thomas Huth schrieb:
> > > Does anybody have a real Mega STE and some means of checking which bit
> > > toggles the frequency?
> > >   
> > I do and I can. It's actually bit /1/ (and not bit 0) which toggles the
> > frequency - verified by measuring the clock at the CPU.
>
> You rock! Thanks, that's perfect! I fixed it in Hatari here now:
>
> https://git.tuxfamily.org/hatari/hatari.git/commit/?id=090bfcc9af2ed94a
>
> Of course also big thanks to Miguel for his tests!

Hi

good catch, it's true that most programs that want to go 16 MHz often 
set cache too, so bits 0 and 1 are set to 1 and we didn't notice that 
bits were inverted.

For example a recent demo "little -me- demo" by overlanders will set cpu 
to 16MHz + cache during the 3D part and go back to 8 MHz after (needs to 
be run in Mega STE mode)

Nicolas