DMZ(4)                                                                  DMZ(4)



NAME
       dmz - DMZ-32 terminal multiplexor

SYNOPSIS
       device dmz0 at uba? csr 0160540
            vector dmzrinta dmzxinta dmzrintb dmzxintb dmzrintc dmzxintc

DESCRIPTION
       The  _d_m_z  device provides 24 lines of asynchronous serial line support.
       Modem control on all ports is available as an option for the H3014 dis‐
       tribution panel.

       Each line attached to a DMZ-32 serial line port behaves as described in
       _t_t_y(4).  Input and output for each line may independently be set to run
       at any of 16 speeds; see _t_t_y(4) for the encoding.

       Bit  _i of flags may be specified for a _d_m_z to to say that a line is not
       properly connected, and that the line should be treated  as  hard-wired
       with carrier always present.  Thus specifying ‘‘flags 0x000004’’ in the
       specification of _d_m_z0 would cause line _t_t_y_a_2 to be treated in this way.

       The  _d_m_z  driver  normally enables the input silos with a short timeout
       (30 milliseconds); this allows multiple characters to be  received  per
       interrupt during periods of high-speed input.

FILES
       /dev/tty[abcefg][0-9a-n]

SEE ALSO
       tty(4)

DIAGNOSTICS
       dmz%d:  NXM  line  %d.   No  response from the UNIBUS on a DMA transfer
       within a timeout period.  This is often followed by  a  UNIBUS  adapter
       error.   This  occurs most frequently when the UNIBUS is heavily loaded
       and when devices which hog the bus (such as RK07s) are present.  It  is
       not serious.

       dmz%d:  silo  overflow.   The character input silo overflowed before it
       could be serviced.  This can happen if a hard error occurs when the CPU
       is running with elevated priority, as the system will then print a mes‐
       sage on the console with interrupts disabled.  It is not serious.

BUGS
       It should be possible to set the silo timeout with a configuration file
       option,  as  the  value  is a trade-off between efficiency and response
       time for flow control and character echo.



4.2 Berkeley Distribution        April 7, 1986                          DMZ(4)