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Annotation of 43BSDTahoe/man/man4/vax/dmz.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1983 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)dmz.4       6.3 (Berkeley) 5/16/86
                      6: .\"
                      7: .TH DMZ 4 "April 7, 1986"
                      8: .UC 5
                      9: .SH NAME
                     10: dmz \- DMZ-32 terminal multiplexor
                     11: .SH SYNOPSIS
                     12: .B "device dmz0 at uba? csr 0160540"
                     13: .br
                     14: .ti +0.5i
                     15: .B "vector dmzrinta dmzxinta dmzrintb dmzxintb dmzrintc dmzxintc"
                     16: .SH DESCRIPTION
                     17: The 
                     18: .I dmz
                     19: device provides 24 lines of asynchronous serial line support.
                     20: Modem control on all ports is available
                     21: as an option for the H3014 distribution panel.
                     22: .PP
                     23: Each line attached to a DMZ-32 serial line port behaves as described
                     24: in
                     25: .IR tty (4).
                     26: Input and output for each line may independently be set to run at any
                     27: of 16 speeds; see
                     28: .IR tty (4)
                     29: for the encoding.
                     30: .PP
                     31: Bit
                     32: .I i
                     33: of flags may be specified for a
                     34: .I dmz
                     35: to to say that a line is not properly connected, and that the
                     36: line should be treated as hard-wired with carrier always present.
                     37: Thus specifying ``flags 0x000004'' in the specification of 
                     38: .IR dmz 0
                     39: would cause line
                     40: .I ttya2
                     41: to be treated in this way.
                     42: .PP
                     43: The
                     44: .I dmz
                     45: driver normally enables the input silos with a short timeout
                     46: (30 milliseconds); this allows multiple characters to be received
                     47: per interrupt during periods of high-speed input.
                     48: .SH FILES
                     49: /dev/tty[abcefg][0-9a-n]
                     50: .SH SEE ALSO
                     51: tty(4)
                     52: .SH DIAGNOSTICS
                     53: .BR "dmz%d: NXM line %d" .
                     54: No response from the UNIBUS on a DMA transfer
                     55: within a timeout period.  This is often followed by a UNIBUS adapter
                     56: error.  This occurs most frequently when the UNIBUS is heavily loaded
                     57: and when devices which hog the bus (such as RK07s) are present.
                     58: It is not serious.
                     59: .PP
                     60: .BR "dmz%d: silo overflow" .
                     61: The character input silo overflowed
                     62: before it could be serviced.  This can happen if a hard error occurs
                     63: when the CPU is running with elevated priority, as the system will
                     64: then print a message on the console with interrupts disabled.
                     65: It is not serious.
                     66: .SH BUGS
                     67: It should be possible to set the silo timeout with a configuration file option,
                     68: as the value is a trade-off between efficiency and response time for flow
                     69: control and character echo.

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