4.3BSD-UWisc/man/cat4/dmz.4

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DMZ(4)              UNIX Programmer's Manual               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 distribution 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 message on the console with
     interrupts disabled.  It is not serious.

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



Printed 12/27/86          April 7, 1986                         1






DMZ(4)              UNIX Programmer's Manual               DMZ(4)



     echo.






















































Printed 12/27/86          April 7, 1986                         2