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   tp_xiorts() - get and optionally set I/O RTS control

   nOldCtrl = tp_xiorts([nNewCtrl])

   nNewCtrl    New IORTS setting.

   Returns     Old IORTS setting.

   IORTS is a global setting.  It controls how file transfer functions
   handle the RTS signal during a Ymodem-G or Zmodem receive:

       IORTS   Action
       ----------------------------------------------------------------
        -1     RTS does not change during writes to disk.
         0     RTS turned off when writing to disk.
        >0     Before writing to disk, turn RTS off and wait IORTS timer
               ticks.  (There are about 18 timer ticks per second.)

   The initial default setting is -1.  The recommended setting when
   running at 9600 baud or faster is 2.