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ReadJoypad_:: ; c000 (3:4000)
; Poll joypad input.
; Unlike the hardware register, button
; presses are indicated by a set bit.
ld a, 1 << 5 ; select direction keys
ld c, 0
ld [rJOYP], a
rept 6
ld a, [rJOYP]
endr
cpl
and %1111
swap a
ld b, a
ld a, 1 << 4 ; select button keys
ld [rJOYP], a
rept 10
ld a, [rJOYP]
endr
cpl
and %1111
or b
ld [hJoyInput], a
ld a, 1 << 4 + 1 << 5 ; deselect keys
ld [rJOYP], a
ret
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