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Annotation of 43BSDReno/share/man/man4/man4.hp300/dcm.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1990 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" This code is derived from software contributed to Berkeley by
        !             5: .\" the Systems Programming Group of the University of Utah Computer
        !             6: .\" Science Department.
        !             7: .\"
        !             8: .\" Redistribution and use in source and binary forms are permitted provided
        !             9: .\" that: (1) source distributions retain this entire copyright notice and
        !            10: .\" comment, and (2) distributions including binaries display the following
        !            11: .\" acknowledgement:  ``This product includes software developed by the
        !            12: .\" University of California, Berkeley and its contributors'' in the
        !            13: .\" documentation or other materials provided with the distribution and in
        !            14: .\" all advertising materials mentioning features or use of this software.
        !            15: .\" Neither the name of the University nor the names of its contributors may
        !            16: .\" be used to endorse or promote products derived from this software without
        !            17: .\" specific prior written permission.
        !            18: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21: .\"
        !            22: .\"    @(#)dcm.4       5.1 (Berkeley) 6/29/90
        !            23: .\"
        !            24: .TH DCM 4 "June 29, 1990"
        !            25: .UC 7
        !            26: .SH NAME
        !            27: dcm \- HP 98642A communications multiplexer
        !            28: .SH SYNOPSIS
        !            29: .B "device             dcm0    at scode? flags 0xe"
        !            30: .SH DESCRIPTION
        !            31: The 98642A is a four port EIA RS-232C (CCITT V.28) communications
        !            32: multiplexer. The 98642A has three direct-connect ports and one port with
        !            33: full modem control.
        !            34: .PP
        !            35: Each line attached to the 98642A behaves as described in
        !            36: .IR tty (4).
        !            37: Input and output for each line may set to one of following baud rates;
        !            38: 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800,
        !            39: 9600, 19200, 38400. See 
        !            40: .IR tty (4)
        !            41: for the encoding.
        !            42: .PP
        !            43: Flags is usually specified as 0xe since 3 of the 4 ports (1-3) do not support
        !            44: modem control and should be treated as hard-wired with carrier always present.
        !            45: If port 0 does not have the need for modem control then flags can be specified
        !            46: as 0xf.
        !            47: .PP
        !            48: Each port on the 98642A has a 128 byte input silo and a 16 byte output silo.
        !            49: Interrupts happen on a per character basis unless the interrupt
        !            50: rate for the card reaches 70 interrupts per second at which time the
        !            51: driver changes to a 16.7ms (60 interrupts per second) polling scheme until 
        !            52: the interrupt rate drops.
        !            53: .SH FILES
        !            54: /dev/tty0[0-9a-f]
        !            55: .SH "SEE ALSO"
        !            56: tty(4)
        !            57: .SH DIAGNOSTICS
        !            58: \fBdcm%d port%d: silo overflow\fR Input Silo has overflowed and incoming data
        !            59: has been lost.
        !            60: .PP
        !            61: \fBdcm%d port%d: uart overflow\fR The 3 character buffer in the uart has
        !            62: overflowed.
        !            63: .SH BUGS
        !            64: Total throughput per card, all ports together, is limited to 76800 bits per
        !            65: second continuous input rate.
        !            66: 

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