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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/targets/sm83/drawing_isr.s

      1         .include	"global.s"
      2 
      3         .area	_HOME
      4 
      5 .drawing_lcd::
      6         ld hl, #rLCDC
      7         ldh a, (rLYC)
      8         cp #72
      9         jr z, 1$
     10         set LCDCF_B_BG8000, (hl)
     11         ld a, #72
     12         ldh (rLYC), a
     13         ret
     14 1$:
     15         WAIT_STAT
     16         res LCDCF_B_BG8000, (hl)
     17         ld a, #144
     18         ldh (rLYC), a
     19         ret

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