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JB               Jump If Below                       Flags: not altered

JB short-label

          Jump Condition:  Jump if CF = 1

    Used after a CMP or SUB instruction, JB transfers control to short-
    label if the first operand was less than the second.  (Both operands
    are treated as unsigned numbers.)  The target of the jump must be
    within -128 to +127 bytes of the next instruction.

  --------------------------------------------------------------------------
   Operands                  Clocks   Transfers  Bytes   Example
   short-label              16 or 4       -        2     JB BELOW
  --------------------------------------------------------------------------

       Notes:         JC (Jump if Carry), JB, and JNAE (Jump if Not Above
                      or Equal), are all synonyms for the same
                      instruction.

                      JB, Jump if Below, should be used when comparing
                      unsigned numbers.

                      JL, Jump if Less Than, should be used when comparing
                      signed numbers.