Routines
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8947: Negate Pair
Two's-complement HL and return.
Input
HL Value to negate
Output
HL Negated value
NegatePair 8947 LD A,L Invert HL and add one.
8948 CPL
8949 LD L,A
894A LD A,H
894B CPL
894C LD H,A
894D INC HL
894E RET Return.
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