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Buenas.

Estaba echando un vistazo a las webs de los desarrolladores de MAME y me he encontrado con esto:

 QUOTE 

There has been a long-standing known bug in dec0.c for some time (checking my notes, it's been there for 7 years!), in that row & column scroll could not be applied to a tilemap simultaneously. The reason for this limitation is that Mame's tilemap system did not support this. Anyway... I've re-implemented the rendering of this sytem by providing a new tilemap draw function that correctly implements simultaneous row & column scroll. I also verified the rendering of all video modes using a trojan on a Birdie Try board. This finally fixes the waterfalls in Midnight Resistance! (It doesn't really affect any other games, but the source code is much cleaner now).

http://www.vcmame.net/wip/

Joder, 7 años para corregir un bug conocido :D :D :D. Así que nadie se queje porque otras cosas tarden algunos meses en arreglarse ;)

bueno como dicen nunca es tarde si la dicha es buena o algo a si.