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Two's Complement Negation                        Flags:  O D I T S Z A P C
                                                         ═════════════════
                                                         ±       ± ± ± ± ±
Syntax:  NEG dest
 
  Replaces the operand with its two's complement.  NEG does this by
  subtracting the operand from 0.  If the operand is 0, the carry flag
  is cleared.  Otherwise the carry flag is set.  If the operand contains
  the maximum possible negative value (-128 for 8-bit operands or -32768
  for 16-bit operands), the value does not change, but the overflow and
  carry flags are set.
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