The Intel 8086 / 8088/ 80186 / 80286 / 80386 / 80486 Instruction Set

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N Instructions

NEG - Two's Complement Negation 

        Usage:  NEG     dest
        Modifies flags: AF CF OF PF SF ZF

        Subtracts the destination from 0 and saves the 2s complement of
        "dest" back into "dest".

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg               3     2     2     1             2
        mem             16+EA   7     6     3            2-4  (W88=24+EA)

NOP - No Operation (90h) 

        Usage:  NOP
        Modifies flags: None

        This is a do nothing instruction.  It results in occupation of both
        space and time and is most useful for patching code segments.
        (This is the original XCHG AL,AL instruction)

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              3     3     3     1             1

NOT - One's Compliment Negation (Logical NOT) 

        Usage:  NOT     dest
        Modifies flags: None

        Inverts the bits of the "dest" operand forming the 1s complement.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg               3     2     2     1             2
        mem             16+EA   7     6     3            2-4  (W88=24+EA)

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