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ADD
Example ADD AX, BX
Adds 2nd operand to the first and stores in first.
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SUB
Example SUB AX, BX
Subtracts2nd operand from first and stores in first.
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INC
Example INC DI
Increase by 1.
If, DI = 5, then after INC DI
DI=6
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DEC
Example DEC DI
Decreases by 1