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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    offset                   Loader-resolved
    OFFSET directive         Offset Address
    offset operators         Address Operators
    OFFSET option            Offset Relative to Segment/Group
    one's-complement
       negation              NOT Instruction
    operators                Arithmetic Operators
    OPTION directive         Set Assembler Options
    OR instruction           Logical OR
    OR operator              Logical and Shift Operators
    ORG directive            Specify Assembly Start Address
    OUT instruction          Output to Port
    OUTS instruction         Output String to Port
    OUTSB instruction        Output String to Port (Bytes)
    OUTSD instruction        Output String to Port (Doublewords)
    OUTSW instruction        Output String to Port (Words)
    OVERFLOW? operator       C-Style Comparison Operators
                                    -♦-