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JNC              Jump If No Carry                    Flags: not altered

JNC short-label

          Jump Condition:      Jump if CF = 0

    JNC transfers control to short-label if the Carry Flag is clear. 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     JNC CARRY_CLEAR
  --------------------------------------------------------------------------

       Note:          Use JC, Jump if Carry, to jump if the carry flag is
                      set.