Command: SHR- Shift logical right
Arguments: OP: register or memory location; QUANTITY: immediate
Usage: SHR OP, QUANTITY
Effects: Shifts all bits of OP right QUANTITY times and adds a 0 at the beginning.
Flags to be set: OF, SF, ZF, PF, CF
Misc: Carry flag contains bit that was shifted out last.
Corresponds to a unsigned division by 2 QUANTITY times