> Besides that, does anyone know why I can't load previous Game & Watch save states
> from MAME 0.212 in 0.215?
> I get this message: "Error: Unable to load state due to an invalid header. Make sure
> the save state is correct for this machine."
> Can MAME use save states from previous versions?
if the emulation changes (different things saved, restructuring of device hiearachy etc.) then states no longer load (as MAME doesn't know how to load them - things don't line up anymore)
this happens rather often in MAME because it's a project that undergoes a huge amount of development.