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Subtract with Borrow                             Flags:  O D I T S Z A P C
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Syntax:  SBB dest,src                                    ±       ± ± ± ± ±
 
 
  Subtracts the source from the destination, then subtracts the value
  of the carry flag from the result. This result is assigned to the
  destination. SBB is used to subtract the least significant portions
  of numbers that must be processed in multiple registers.
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