> > > 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.
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