[hatari-devel] some videl emulation news

[Laurent Sallafranque]

Hi Mikro,

 > No need to be pessimistic. Patrice, me, Anders and possibly some 
others many times had helped with exactly this -- to test some behavior, 
check some registers etc... So Falcon coders are still here, just ask 
your question ;)

That's true. I thank you all who help on Falcon.

I have sometime "strange" questions :), but I'm not an expert of the 
Falcon (neither the ST) like you are.
(I understand general things about electronics, CPUs, ...), I've coded a 
little under real atari (1 demo) and some things under Falcon (some 3d 
mapping, ...).

Your help is always welcome

Laurent


Le 06/06/2011 23:45, Miro Kropáček a écrit :
>
>     So even a program on a real Falcon that would expect the dsp<->cpu
>     synchronisation to work without any sync control is likely to fail
>     (unless you take the cache behaviour into account, which is more
>     complicated when coding in asm).
>
> You are absolutely right here. It's true we don't have so variable HW 
> setups like in Amiga world (where acceleration boards were present by 
> "default", i.e. nobody counted on plain a1200's speed) but having DSP 
> <-> 030 unsynchronized was considered as pure madness even in the most 
> hardcore Falcon demo times. Lack of dsp sync is present only in the 
> tightest inner-loops.
>
>     That's why I think that for most programs, even a bad number of
>     cycles should not create so many bugs. There may be 2 or 3 general
>     issues to fix, but I don't think so many things need to be corrected.
>
> Exactly.
>
>     I don't want to sound pessimistic, but unless someone can help
>     with some real Falcon coding experiment in video/dsp fields and
>     provide some very simple test programs to show some non working
>     aspects in Hatari, then I think it will be very difficult to
>     improve Falcon's emulation.
>
>     So, any experiment Falcon coder (not me !) should raise his hand :)
>
> No need to be pessimistic. Patrice, me, Anders and possibly some 
> others many times had helped with exactly this -- to test some 
> behavior, check some registers etc... So Falcon coders are still here, 
> just ask your question ;)
>
> -- 
> MiKRO / Mystic Bytes
> http://mikro.atari.org

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