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