Unused
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A1AA: Negate Word
Unused. Nothing in the game calls this routine.
Input
HL Word to negate
Output
HL #-HL
HL=-HL.
NegateWord A1AA PUSH DE Stash DE on the stack.
A1AB EX DE,HL Switch the word into DE.
A1AC LD HL,$0000 HL=0000.
A1AF AND A HL=HL-DE.
A1B0 SBC HL,DE
A1B2 POP DE Restore DE from the stack.
A1B3 RET Return.
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