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analoguejb / Analogue-Nt-Mini-Noir-JB

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Battletoads - Double Dragon (USA) crashes on boss of level 1.2 #6

Open wiselinkpro opened 1 year ago

wiselinkpro commented 1 year ago

I'm assuming that we have to wait 2 years for new issues such as this to get fixed. smh. I'm probably going to have to get a MiSTer. It's like every 2nd NES game I try on this thing with a new JB crashes and freezes the whole game lol. Kinda disappointing considering this thing cost over 500 dollars.

GreatHierophant commented 1 year ago

The Battletoads & Double Dragon issue is well known in the NES emulation community:
They read from WRAM at $6000–$7FFF despite there being none on the cartridge, relying on the values produced by open bus behavior.[1] Additionally, LGM disables WRAM through $A001, which some emulators disregard in order to kludge MMC6 games into working. If WRAM is present and enabled, some pre-loaded values will cause BT&DD to crash at the end of stage 1 when Abobo makes his first appearance and LGM to crash when playing boss music.[2]

A properly-headered NES 2.0 ROM will make the Abobo appearance work normally. Look for NewRisingSun's headered 2.0 ROM set.