Re: [hatari-devel] Blitter bug in STe mode

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 16/06/2020 à 08:38, Christian Zietz a écrit :
> Nicolas Pomarède schrieb:
>
> > problem should now be fixed ; I added a RMW flag to the cpu emulation in
> > the case of TAS, and the blitter will now delay its restart in non hog
> > mode in case the blitter's 1st bus access happens during a RMW operation.
>
> I can confirm that it's fixed. At least, I don't get the the on-screen
> artifacts anymore when using EmuTOS (with Blitter enabled) under Hatari
> built from current Git code. Thank you for the quick response!

BTW, this only happened in cycle exact mode because in that mode the 
blitter accurately emulates the bus sharing between cpu and blitter 
every 64 bus accesses. This allows for example to run part of one cpu 
instruction in parallel to the blitter, such as a MUL or a DIV.

I don't think steem supports this accurate "parallel" mode, which might 
be why the bug didn't show with emutos + steem.

Nicolas