Description

   The TL820 family of libraries uses an Input/Output Device (IOD)
   to allow putting tapes into the library and taking them out. The
   inport part of the IOD holds a single cartridge and has a door on
   top which must be opened before a cartridge can be placed in it.
   A button on the front of the IOD opens the door, but only after
   it has been enabled by a Ready IOD command. This is a vendor
   unique command specific to the TL820 family.

   The mrd_ready_inport(3mrd) routine allows sending a Ready IOD
   command to the robot and port specified by the robot_name
   and inport arguments. For all currently shipping TL820 family
   libraries there is only one Inport, so the inport argument can
   always be "0". On a TL820, when the source for a move in the
   Inport, this routine should be called first and time allowed
   for the operator to place a tape in the inport. The routine mrd_
   move(3mrd) expects the element to be full when it starts.