Re: [hatari-devel] Mega ST(E)

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 12/06/2016 à 14:34, Thomas Huth a écrit :
> Am Sun, 12 Jun 2016 13:11:47 +0200
> schrieb Nicolas Pomarède <npomarede@xxxxxxxxxxxx>:
>
> > Le 12/06/2016 à 12:56, Thomas Huth a écrit :
> >
> > > > Also, I think we could add support for megast reg ff8e21 ; it just
> > > > allows to set cache on/off and to change cpu speed from 8 to 16
> > > > Mhz.
> > >
> > > Yes, why not, do you've got some spare minutes to do this?
> >
> > Yes, I will handle it. This will fix the game "tymewarp" which should
> > also work under mega ste, but doesn't so far (ff8e21 doesn't seem to
> > be present in megastf)
>
> Right, as far as I know, the normal Mega STs could not run with 16 MHz
> and did not have a cache. That's only features of the Mega STE.

Register added for megaste ; we can see that if cpu is set to 16 MHz 
before starting 'Tymewarp' (http://www.pouet.net/prod.php?which=15943), 
then it correctly goes to 8 MHz when the game starts.

On a side note, I see that in the code you added in ioMem.c for 
STF/MegaSTF, fix functions are called before filling the whole IO space. 
This results in these kinds of warning :

IoMem_Init: Warning: $ff820a (R) already defined
IoMem_Init: Warning: $ff820a (W) already defined

It's harmless, but maybe we could fill default IO space first, then 
apply fixes for each machine ?

Nicolas