User:Qalle/Algorithms

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Miscellaneous algorithms that may be useful on the NES.

8-bit unsigned integer to 3 decimal ASCII digits

Source: [1] 

  ; in: A = unsigned integer
  ; out: Y/X/A = ASCII digits of hundreds/tens/ones
  ldy #$2f  ; ASCII("0") - 1
  ldx #$3a  ; ASCII("9") + 1
  sec
- iny
  sbc #100
  bcs -
- dex
  adc #10
  bmi -
  adc #$2f  ; ASCII("0")

References

  1. ↑ Tiny .A to ASCII routine, Codebase64
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