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11 行
271B

  1. ; safe-vic-bit-set.asm
  2. ; Demonstrates read-modify-write for VIC-II registers.
  3. ; Enables sprite 0 without changing other sprite-enable bits.
  4. * = $c000
  5. start: lda $d015 ; VIC-II sprite enable
  6. ora #$01 ; set bit 0
  7. sta $d015
  8. rts

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