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

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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