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  Title:    Subtract with Borrow                  Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   SBB dest,src                                 ±       ± ± ± ± ±
 
  See also: SUB, CLC, ADD, ADC
 
  Description:
 
     Adds the carry flag to the second operand, then subtracts that
     value from the first operand. This result is assigned to the first
     operand. Use SBB to subtract the least significant portions of
     numbers that must be processed in multiple registers.
                                    -♦-