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30 .\" from: @(#)dz.4 8.1 (Berkeley) 6/5/93
39 serial multiplexer device interface
41 .Cd "dz0 at uba0 csr 0160100 vector dzrint dzxint"
45 provides 8 communication lines with partial modem control,
52 may be supplied with the device specification
53 in the config file indicating
54 that the line corresponding to
58 connected, and should be treated as hard-wired with carrier
59 always present. Thus specifying
65 to be treated in this way.
68 control parameters for individual lines are managed by
71 Line speeds may be initiated via
84 driver monitors the rate of input on each board,
85 and switches between the use of character-at-a-time interrupts
87 While the silo is enabled during periods of high-speed input,
88 the driver polls for input 30 times per second.
90 .Bl -tag -width /dev/tty[0-9][0-9]xx -compact
91 .It Pa /dev/tty[0-9][0-9]
92 .It Pa /dev/ttyd[0-9a-f]
97 .It dz%d: silo overflow .
98 The 64 character input silo overflowed
99 before it could be serviced. This can happen if a hard error occurs
102 is running with elevated priority, as the system will
103 then print a message on the console with interrupts disabled.