Routines
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B577: ABS(hl-de)
Used by the routines at _8ac9_Enter, Path_InGivenRange, Bg_DrawJunction, A80E and _b0ea.
abs_hl_de B577 AND A
B578 SBC HL,DE
B57A RET P
B57B LD A,L
B57C CPL
B57D LD L,A
B57E LD A,H
B57F CPL
B580 LD H,A
B581 INC HL
B582 RET
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