iona(7)              INTERACTIVE UNIX System              iona(7)



          NAME
               iona - UnTerminal I/O network adapter serial driver

          DESCRIPTION
               The iona driver supports up to eight serial ports on two
               UnTerminal I/O network adapter (IONA) boards.  The ports can
               be programmed for speed (50-19200 baud), character length,
               and parity.  Output speed is always the same as input speed.
               The ports behave as described in termio(7).

               The asynchronous port is a character-at-a-time device for
               both input and output.  This characteristic both limits the
               bandwidth which can be achieved over a line, and increases
               the interrupt loading on the central processor.  In particu-
               lar, file transfer programs such as uucp(1) may not function
               well at speeds over 9600 baud.

               The baud rates of the serial adapter programmable baud-rate
               generator do not correspond exactly with system baud rates.
               In particular, setting B0 will cause a disconnect, setting
               EXTA will set 19200 baud, and setting EXTB will set 38400
               baud.  It is not possible to directly set 2000, 3600, or
               7200 baud.

               Because of a current hardware limitation, the modem control
               bit will be disabled when the parallel printer interface is
               used on an IONA remote station (see iolp(7)).

             Minor Device Numbers
               The asynchronous port is a character device.  The low-order
               4 bits (bits 0-3) of the minor device number correspond to
               the remote station at which the port is located.  Bit 4
               enables modem control on the port.

          FILES
               /dev/iona*

          SEE ALSO
               asy(7), iolp(7), termio(7), vna(7).
               signal(2) in the INTERACTIVE SDS Guide and Programmer's
               Reference Manual.

          ADDED VALUE
               This entry, supplied by INTERACTIVE Systems Corporation, is
               an extension of UNIX System V.










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