[hatari-devel] Cebit93 demo seems to run well too (no more screen update problems)

[Eero Tamminen]

Hi,

Le 26/01/2011 14:43, Laurent Sallafranque a écrit :
>> Cebit93 demo seems to run well too (no more screen update problems).
>> 
>> Music is clean too.
>
> No, it only works at 32 Mhz, at 16 Mhz, the screen is not correctly
> updated.

With --cpuclock 32 it works fine with 1.4 release too, not just latest
Hatari.

 
> This demo doesn't involve the DSP at all.
> 
> So, the 16/32 Mhz problem seem to be only related to the 68x000 part of
> the computer.

Right.  It's an interesting case for the Falcon timings as they're so
clearly visible, but only in what's shown on screen.


> I think it may comes from Videl emulation missing (wrong VBL, HBL, ...)
> Do you agree ?

videl.c emulation doesn't do any HBL (line/palette switching stuff), it just
shows the whole screen at VBL from a memory position given in registers
and size given in registers with palette coming from suitable STe/TT/Falcon
registers.

The HBL stuff is all in video.c and AFAIK completely ST/STE specific.
All that stuff is quite hairy (full of special cases), I think currently
only Nicolas understands fully how it works, so I think this will need
his involvement...  It should be fairly well traceable nowadays though.


	- Eero