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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     See also: Scaled Index Mode (386+), 16/32-Bit Overrides (386+)
 
     Encodings are shown below for each instruction variation.
 
     Select an abbreviation for more information.
 
     Abbreviation     Description
 
     d                Transfer direction bit
     a                Accumulator direction bit
     w                Word/byte bit
     s                Sign bit
     mod              Register/memory mode
     reg              General-purpose register
     sreg             Segment register/override
     r/m              Register/memory operand type
     disp             Address displacement
     data             Constant data
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