Routines
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46742: Multiply x- or y-velocity of axe by minus one
Used by the routine at 46560.
Input
IX Address of x or y "velocity" of axe minus two
46742 LD A,(IX+2) Load A with x "velocity" of axe
46745 NEG Multiply velocity by minus one
46747 LD (IX+2),A Load back into data block
46750 XOR A Set A to zero
46751 RET Return
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