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NEG              Negate                              Flags: O D I T S Z A P C
                                                            *       * * * * *
NEG destination

          Logic:    destination . -destination      ; two's complement

    NEG subtracts the destination operand from 0 and returns the result in
    the destination. This effectively produces the two's complement of the
    operand. The operand may be a byte or a word.

  --------------------------------------------------------------------------
   Operands                  Clocks   Transfers  Bytes   Example
                           byte(word)
   register                    3          -        2     NEG DL
   memory                 16(24) + EA     2       2-4    NEG COEFFICIENT
  --------------------------------------------------------------------------

       Note:          If the operand is zero, the carry flag is cleared;
                      in all other cases, the carry flag is set.

                      Attempting to negate a byte containing -128 or a
                      word containing -32,768 causes no change to the
                      operand and sets the Overflow Flag.