Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Select an instruction for more information.
 
     Instruction     Description
 
     ADD             Add
     ADC             Add with carry (add values in multiple registers)
     INC             Increment (add 1)
     SUB             Subtract
     SBB             Subtract with borrow (subtract values in multiple
                     registers)
     DEC             Decrement (subtract 1)
     NEG             Negate (two's complement)
     IMUL            Signed multiply
     MUL             Unsigned multiply
     IDIV            Signed division
     DIV             Unsigned division
     XADD            Add and move destination to source register (486+)
 
     See also: Floating Point Instructions, Logical and
               Shift Instructions, Binary Coded Decimal Instructions
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