PIA Registers


Source: Mapping the Atari, by Ian Chadwick

Index


PORTA ($D300)

Bit 7 6 5 4 3 2 1 0
Jack Player 2 Player 1
Joystick Right Left Back Forth Right Left Back Forth
Paddle Trigger 3 2 1 0
Keypad Row 4 3 2 1 4 3 2 1


PORTB ($D301)

Self Test ROM Reserved LED #2 LED #1 BASIC ROM OS ROM


PACTL ($D302)

IRQ Status 0 1 1 Motor Control Data / Direction 0 IRQ Enable


PBCTL ($D303)

IRQ Status 0 1 1 SIO Command Data / Direction 0 IRQ Enable


Miscellaneous Notes


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