Command: MOVSW - Move Word from String to String
Arguments: none
Usage: MOVSW
Effects: Copies the word at [DS:SI] or [DS:ESI] to [ES:DI] or [ES:EDI]. It then increments or decrements (depending on the direction flag: increments if the flag is clear, decrements if it is set) SI and DI (or ESI and EDI) by 2.
Flags to be set: none