4.3BSD - /usr/man/cat4/dmz.0

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  dmz  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
       tty(4).  Input and output for each line may independently be set to run
       at any of 16 speeds; see tty(4) for the encoding.

       Bit  i of flags may be specified for a dmz 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 dmz0 would cause line ttya2 to be treated in this way.

       The  dmz  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)