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Some games work flawlessly even on wildly inaccurate emulators, others require exact emulation of subtle behaviour (and even then some still don’t work).

Nuke (PD)

Inputs do not work unless auto joypad polling is correct.

SpellCraft - Acts of Valor (USA) (Proto)

At the title screen, pressing B may bring up the main menu and automatically select New Game rather than letting you choose a different option.

This occurs if the HVBJOY registor does not correctly report whether auto joypad polling is active.

Super Conflict

Sends random inputs even with no buttons pressed, unless auto joypad polling is correct.

Super Star Wars

Start button auto-unpauses unless auto joypad polling is correct.

Taikyoku Igo - Goliath

Start button does not work at the title screen unless auto joypad polling is correct.

Tatakae Genshijin 2

Attract sequence ends early unless auto joypad polling is correct.

Williams Arcade’s Greatest Hits

Inputs fire on their own, or menu items sometimes skipped unless auto joypad polling is correct.

World Masters Golf

On the main menu, holding the D-pad moves the cursor continuously instead of only once, unless auto joypad polling is correct.