> > > the hardware is different (Aes lacks things like the watchdog timer) MAME treats
> > them
> > > as different machines.
> >
> > Wow, I didn't know this. I always thought the main difference between MVS and AES
> > were the video & audio output (since a TV would not use your typical arcade
> > connectors) and a different bios.
>
> No, there are other subtle differences too, it's how some of the protection schemes
> work even - the MVS codepaths in a number of the mid-late period games will sit in a
> loop waiting for the watchdog timer to reset them, if that doesn't happen they'll
> display a 'for use only on original MVS hardware' screen (or sometimes break the game
> in subtle ways) once that check has passed the status is saved in sram so it doesn't
> happen again tho. This was done to prevent AES owners using an MVS bios or otherwise
> hacking their AES system to run the games in MVS mode.
>
> That's why some of the neogeo arcade games in MAME will do the reset process twice on
> startup, the additional reset is the one done by the watchdog timer.
Hot dang
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That's pretty dang cool. *nt*
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