Joypad: Difference between revisions
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Revision as of 05:47, 8 March 2011
Need picture and clear bit definitions of registers.
Registers used to read the button's states directly:
- REG_P1CNT ($300000), byte for DCBARLDU of player 1.
- REG_P2CNT ($340000), byte for DCBARLDU of player 2.
- REG_STATUS_B ($380000), byte for xxxx Select2 Start2 Select1 Start2.
A BIOS call can be used to read joypads more easily. The call sets values in the BIOS's RAM space which gives currently-pressed, state-change, and "repeat" values for both joypads.