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gbdk-2020

GameBoy Development Kit
download: https://git.y1.nz/archives/gbdk.tar.gz
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gbdk-lib/libc/asm/z80/abs.s

      1         .area   _CODE
      2 
      3         .globl _abs
      4 
      5 _abs:
      6         xor a
      7         ex  de, hl
      8         ld h, a
      9         ld l, a
     10         sbc hl, de
     11         ex de, hl
     12         ret p
     13         ex de, hl
     14         ret
     15

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