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+.\"	$NetBSD: dcm.4,v 1.10 2017/02/17 22:24:46 christos Exp $
+.\"
+.\" Copyright (c) 1990, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Systems Programming Group of the University of Utah Computer
+.\" Science Department.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)dcm.4	8.1 (Berkeley) 6/9/93
+.\"
+.Dd February 17, 2017
+.Dt DCM 4 hp300
+.Os
+.Sh NAME
+.Nm dcm
+.Nd
+.Tn HP98642A
+serial communications multiplexer
+.Sh SYNOPSIS
+.Cd "dcm* at dio? scode ? flags 0xe"
+.Sh DESCRIPTION
+The
+.Tn 98642A
+is a four port
+.Tn EIA
+.Tn RS-232C
+.Pf ( Tn CCITT
+.Tn V.28 )
+communications
+multiplexer. The
+.Tn 98642A
+has three direct-connect ports and one port with
+full modem control.
+.Pp
+Input and output for each line may set to one of following baud rates;
+50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800,
+9600, 19200, 38400.
+.Pp
+.Ar Flags
+is usually specified as 0xe since 3 of the 4 ports (1-3) do not support
+modem control and should be treated as hard-wired with carrier always present.
+If port 0 does not have the need for modem control then flags can be specified
+as
+.Ql 0xf .
+.Pp
+Each port on the
+.Tn 98642A
+has a 128 byte input silo and a 16 byte output silo.
+Interrupts happen on a per character basis unless the interrupt
+rate for the card reaches 70 interrupts per second at which time the
+driver changes to a 16.7ms (60 interrupts per second) polling scheme until
+the interrupt rate drops.
+.Sh FILES
+.Bl -tag -width /dev/tty0[0-9a-f] -compact
+.It Pa /dev/tty0[0-9a-f]
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It dcm%d port%d: silo overflow
+Input Silo has overflowed and incoming data
+has been lost.
+.Pp
+.It dcm%d port%d: uart overflow
+The 3 character buffer in the UART has
+overflowed.
+.El
+.Sh SEE ALSO
+.Xr hp300/dio 4 ,
+.Xr tty 4
+.Sh BUGS
+Total throughput per card, all ports together, is limited to 76800 bits per
+second continuous input rate.