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C64_SKILLS
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C64_SKILLS/examples/assembly/safe-vic-bit-set.asm

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  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. 

  5.         * = $c000

  6. 

  7. start:  lda $d015      ; VIC-II sprite enable

  8.         ora #$01       ; set bit 0

  9.         sta $d015

  10.         rts

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