BIT_A_BUTTON EQU 0
BIT_B_BUTTON EQU 1
BIT_SELECT   EQU 2
BIT_START    EQU 3
BIT_D_RIGHT  EQU 4
BIT_D_LEFT   EQU 5
BIT_D_UP     EQU 6
BIT_D_DOWN   EQU 7

A_BUTTON EQU %00000001
B_BUTTON EQU %00000010
SELECT   EQU %00000100
START    EQU %00001000
D_RIGHT  EQU %00010000
D_LEFT   EQU %00100000
D_UP     EQU %01000000
D_DOWN   EQU %10000000

R_FLIPPER EQU A_BUTTON
L_FLIPPER EQU D_LEFT
FLIPPERS EQU L_FLIPPER | R_FLIPPER