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Apple 2 Print Unsigned Int16
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Assembly 86.6%
Makefile 8%
C 5.4%
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README.md

Print unsigned 16-bit

6502 assembly code to print an unsigned 16-bit in decimal.

Features:

  • Highly optimized for space
  • No zero-page usage version 79 ($4F) bytes
  • With zero-page usage version 69 ($45) bytes
  • With stack var usage version 83 ($53) bytes
  • Only 2 ROM entry points used: PRHEXZ, SCRN2
  • Includes 7 byte demo

Machine Code

Copy/Paste into your favorite emulator.

Sans-Zero-Page version:

0800:A9 12 A2 34 4C 07 08 8E
0808:55 08 A2 00 8E 52 08 8E
0810:53 08 8E 54 08 A2 10 F8
0818:0E 55 08 2A 48 A0 FD B9
0820:55 07 79 55 07 99 55 07
0828:C8 D0 F4 68 CA D0 E9 D8
0830:A0 03 B9 51 08 20 3F 08
0838:88 D0 F7 8A F0 0E 60 48
0840:20 7B F8 20 49 08 68 29
0848:0F D0 01 CA E8 F0 EF 4C
0850:E5 FD 00 00 00 00

With-Zero-Page version:

0900:A9 12 A2 34 4C 07 09 86
0908:FC 48 A0 00 84 FD 84 FE
0910:84 FF A0 10 F8 06 FC 68
0918:2A 48 A2 FD B5 00 75 00
0920:95 00 E8 D0 F7 88 D0 ED
0928:68 D8 A0 03 B9 FC 00 20
0930:39 09 88 D0 F7 8A F0 0E
0938:60 48 20 7B F8 20 43 09
0940:68 29 0F D0 01 CA E8 F0
0948:EF 4C E5 FD

With-Stack-Page version:

0A00:A9 12 A2 34 4C 07 0A A0
0A08:00 48 DA 5A 5A 5A A0 10
0A10:F8 BA 8E 30 0A 1E 04 01
0A18:3E 05 01 20 3C 0A 20 3C
0A20:0A 20 3C 0A 88 D0 EA D8
0A28:BD 00 01 20 47 0A CA E0
0A30:00 D0 F5 8A 69 04 AA 9A
0A38:98 F0 19 60 BD 01 01 7D
0A40:01 01 9D 01 01 E8 60 48
0A48:20 7B F8 20 51 0A 68 29
0A50:0F D0 01 88 C8 F0 E4 4C
0A58:E5 FD

License

WTFPL

Thanks

  • qkumba for great optimization ideas as always
  • Gids for a gentle nudge to have a zero-page version
  • Everyone on comp.sys.apple2

References

Apple Monitor: Print Integer?