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jede 2020-05-25 22:25:14 +02:00 committed by greg-king5
parent e8b1d51d28
commit 1d358a4734

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@ -91,18 +91,22 @@ COUNT:
READ:
beq right
lda #%10000000
ora VIA2::PRB
lda VIA2::PRB
and #%01111111
ora #%01000000
sta VIA2::PRB
; then read
lda VIA2::PRB
eor #%10011111
rts
right:
lda #%01000000
ora VIA2::PRB
sta VIA2::PRB
right:
lda VIA2::PRB
and #%10111111
ora #%10000000
sta VIA2::PRB
; then read
lda VIA2::PRB
eor #%01011111