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30 .\" from: @(#)dmf.4 8.1 (Berkeley) 6/5/93
39 serial terminal multiplexor
41 .Cd "dmf0 at uba? csr 0160340 vector dmfsrint dmfsxint dmfdaint dmfdbint dmfrint dmfxint dmflint"
43 NOTE: This driver has not been ported from
49 device provides 8 lines of asynchronous serial line support.
50 The first two of these have full modem control.
51 The device also provides a line printer port
57 During autoconfiguration, the driver examines the configuration of each
59 and adjusts the interrupt vectors so that fewer vector locations are used
64 may be supplied with the device specification
65 in the config file indicating
66 that the line corresponding to
70 connected, and should be treated as hard-wired with carrier
71 always present. Thus specifying
77 to be treated in this way.
78 Flags should be set for all lines without hardware support for modem control.
82 control parameters for individual lines are managed by
85 Line speeds may be initiated via
89 or may be communicated by other programs which
97 The serial line part of the
99 driver normally enables the input silos with a short timeout
100 (30 milliseconds); this allows multiple characters to be received
101 per interrupt during periods of high-speed input.
103 A line printer port on a
106 a minor device number of the form
110 Column and lines per page may be changed from the default
111 132 columns and 66 lines by encoding the number of columns
112 in bits 8-15 of flags and the number of lines in bits 16-23.
113 This device does not provide the fancy output canonicalization
118 .Bl -tag -width "/dev/tty[A-CE-I][0-7]" -compact
119 .It Pa /dev/tty[A-CE-I][0-7]
120 .It Pa /dev/ttyd[0-7]
125 .It dmf%d: NXM line %d.
129 within a timeout period. This is often followed by a
132 error. This occurs most frequently when the
135 and when devices which hog the bus (such as
140 .It dmf%d: silo overflow.
141 The character input silo overflowed
142 before it could be serviced. This can happen if a hard error occurs
145 is running with elevated priority, as the system will
146 then print a message on the console with interrupts disabled.
149 .It dmfsrint, dmfsxint, dmfdaint, dmfdbint.
150 One of the unsupported parts of the dmf interrupted; something
151 is amiss, check your interrupt vectors for a conflict with another
162 It should be possible to set the silo timeout with a configuration file option,
163 as the value is a trade-off between efficiency and response time for flow
164 control and character echo.