the mov instruction copies a value from one register or variable to another.

The mov instruction cannot be used to move from one memory address to another. The value must first be moved to a register, then moved to a memory address.

mov ax,dx moves dx into ax.

mov ah,var2 moves var2 into ah.

mov ah,ah does not work.

mov ax,ah does not work; a byte and word cannot be combined.

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