Routines
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BE03: Halve Number
Used by the routines at ReverseAndHalveSpeed, CheckTerrainCollision and TakeThreeEighths.
Divides a signed number by two.
Input
HL Number
Output
HL Number divided by two
HalveNumber BE03 SRA H Shift H right keeping the sign.
BE05 RR L Rotate L right through the carry.
BE07 RET Return.
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