Routines
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C57C: smells like scanline/buffer pointer movement
Used by the routine at C598.
C57C LD A,E E -= 32
C57D SUB $20
C57F LD E,A
C580 JP C,$C5A7 Jump if it went -ve
C583 LD A,D D += 16
C584 ADD A,$10
C586 LD D,A
C587 JP $C5A7 jump
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