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30 .\" from: @(#)dmz.4 8.1 (Berkeley) 6/5/93
39 serial terminal multiplexor
41 .Cd "dmz0 at uba? csr 0160540" "vector dmzrinta dmzxinta dmzrintb dmzxintb dmzrintc dmzxintc"
43 NOTE: This driver has not been ported from
49 device provides 24 lines of asynchronous serial line support.
50 Modem control on all ports is available
51 as an option for the H3014 distribution panel.
55 may be supplied with the device specification for
57 in the config file indicating
58 that the line corresponding to
62 connected, and should be treated as hard-wired with carrier
63 always present. Thus specifying
69 to be treated in this way.
73 control parameters for individual lines are managed by
76 Line speeds (there are 16 choices for the
82 or may be communicated by other programs which
92 driver normally enables the input silos with a short timeout
93 (30 milliseconds); this allows multiple characters to be received
94 per interrupt during periods of high-speed input.
96 .Bl -tag -width /dev/tty[abcefg][0-9a-n] -compact
97 .It Pa /dev/tty[abcefg][0-9a-n]
101 .It dmz%d: NXM line %d.
107 within a timeout period. This is often followed by a
110 error. This occurs most frequently when the
113 and when devices which hog the bus (such as
118 .It dmz%d: silo overflow.
119 The character input silo overflowed
120 before it could be serviced. This can happen if a hard error occurs
123 is running with elevated priority, as the system will
124 then print a message on the console with interrupts disabled.
135 It should be possible to set the silo timeout with a configuration file option,
136 as the value is a trade-off between efficiency and response time for flow
137 control and character echo.