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Annotation of 43BSDTahoe/man/man4/vax/dz.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 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: .\"    @(#)dz.4        6.2 (Berkeley) 5/16/86
        !             6: .\"
        !             7: .TH DZ 4 "May 16, 1986"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: dz \- DZ-11 communications multiplexer
        !            11: .SH SYNOPSIS
        !            12: .B "device dz0 at uba0 csr 0160100 vector dzrint dzxint"
        !            13: .SH DESCRIPTION
        !            14: A DZ11 provides 8 communication lines with partial modem control,
        !            15: adequate for UNIX dialup use.
        !            16: Each line attached to the DZ11 communications multiplexer
        !            17: behaves as described in
        !            18: .IR tty (4)
        !            19: and may be set to run at any of 16 speeds; see
        !            20: .IR tty (4)
        !            21: for the encoding.
        !            22: .PP
        !            23: Bit
        !            24: .I i
        !            25: of flags may be specified for a dz to say that a line is not properly
        !            26: connected, and that the line should be treated as hard-wired with carrier
        !            27: always present.  Thus specifying ``flags 0x04'' in the specification of dz0
        !            28: would cause line tty02 to be treated in this way.
        !            29: .PP
        !            30: The
        !            31: .I dz
        !            32: driver monitors the rate of input on each board,
        !            33: and switches between the use of character-at-a-time interrupts
        !            34: and input silos.
        !            35: While the silo is enabled during periods of high-speed input,
        !            36: the driver polls for input 30 times per second.
        !            37: .SH FILES
        !            38: /dev/tty[0-9][0-9]
        !            39: .br
        !            40: /dev/ttyd[0-9a-f]              dialups
        !            41: .SH "SEE ALSO"
        !            42: tty(4)
        !            43: .SH DIAGNOSTICS
        !            44: .PP
        !            45: \fBdz%d: silo overflow\fR.  The 64 character input silo overflowed
        !            46: before it could be serviced.  This can happen if a hard error occurs
        !            47: when the CPU is running with elevated priority, as the system will
        !            48: then print a message on the console with interrupts disabled.
        !            49: It is not serious.

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