Re: [hatari-devel] It seems I encounter a bug into hatari

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

You're right again ;)
I should have taken more time before replying.

In Racer, I use byte values most of the time, that's why it works.
And of course, it didn't work when I used long values.


Here are the results of the 2 tests :

1st test :

Under Falcon:
move.l #$ffeeddcc,$ffff8240.w
D1 ($ffff8240.w) = $0fee
D2 ($ffff8242.w) = $0dcc

Under hatari :
move.l #$ffeeddcc,$ffff8240.w
D1 ($ffff8240.w) = $ffee
D2 ($ffff8242.w) = $ddcc


2nd test :

Under Falcon:
move.l #$ffffffff,$ffff8240.w
D1 ($ffff8240.w) = $0fff
D2 ($ffff8242.w) = $0fff

Under hatari :
move.l #$ffffffff,$ffff8240.w
D1 ($ffff8240.w) = $ffff
D2 ($ffff8242.w) = $ffff


Don't hesitate to ask if you want me to make more tests or to test some 
other registers that would help improving hatari.

Regards

Laurent


Le 27/03/2014 17:42, Nicolas Pomarède a écrit :
> Le 27/03/2014 17:39, laurent.sallafranque@xxxxxxx a écrit :
> > Hi,
> >
> > You're right Thomas.
> > It seems I can abuse these registers in word size (Racer works well 
> > to confirm that), but not in long words.
> >
> > I've written a little program based on Nicolas 's asking which 
> > displays the values of the registers $ff8240 and $ff8242 when I first 
> > write a long word into them.
> >
> > I'll send you the result values on both my falcon and Hatari tonight.
>
> But even 16 bit words doesn't seem possible ; a color register has 
> only 12 bits in STE mode (bits 12-15 are set to 0).
>
> Maybe in falcon these bits can store informations, but that would be 
> surprising as this can really break compatibility with many programs 
> that try to run in STF/STE mode on Falcon.
>
> Nicolas