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JO               Jump If Overflow                    Flags: not altered

JO short-label

          Jump Condition:      Jump if OF = 1

    JO transfers control to short-label if the Overflow Flag is set.  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     JO SIGNED_OVERFLOW
  --------------------------------------------------------------------------

       Notes:         Use JNO, Jump if No Overflow, to jump if the
                      overflow flag is clear.