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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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