115 lines
3.3 KiB
Groff
115 lines
3.3 KiB
Groff
.\" $NetBSD: dhu.4,v 1.10 2002/01/15 02:07:39 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 1985, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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: @(#)dhu.4 8.1 (Berkeley) 6/5/93
|
|
.\"
|
|
.Dd June 5, 1993
|
|
.Dt DHU 4 vax
|
|
.Os
|
|
.Sh NAME
|
|
.Nm dhu
|
|
.Nd
|
|
.Tn DHU-11/DHV-11
|
|
serial communications multiplexer
|
|
.Sh SYNOPSIS
|
|
.Cd "dhu0 at uba0 csr 0160440"
|
|
.Sh DESCRIPTION
|
|
A
|
|
.Tn DHU-11
|
|
provides 16 communication lines.
|
|
.Pp
|
|
Normal I/O
|
|
control parameters for individual lines are managed by
|
|
.Xr ioctl 2
|
|
calls.
|
|
Individual
|
|
.Tn DHU-11
|
|
lines may be configured to run at any of 13 speeds
|
|
(50, 200 and 38400 baud are not available);
|
|
the speed may be set via
|
|
.Xr getty 8
|
|
or
|
|
.Xr stty 1
|
|
or may be communicated by other programs which
|
|
utilize
|
|
.Xr ioctl 2
|
|
such as
|
|
.Xr ifconfig 8 ,
|
|
see
|
|
.Xr tty 4 .
|
|
.Pp
|
|
The
|
|
.Tn DHU-11
|
|
driver normally uses input silos
|
|
and delays receiver interrupts by 20 milliseconds
|
|
rather than taking an interrupt on each input character.
|
|
.Sh FILES
|
|
.Bl -tag -width /dev/tty[S-Z][0-9a-f]xx -compact
|
|
.It Pa /dev/tty[S-Z][0-9a-f]
|
|
.El
|
|
.Sh NOTES
|
|
The driver currently does not make full use of the hardware
|
|
capabilities of the
|
|
.Tn DHU-11 ,
|
|
for dealing with
|
|
.Tn XON/XOFF
|
|
flow-control or hard-wired
|
|
lines for example.
|
|
.Pp
|
|
Although the devices are not the same, a
|
|
.Tn DHU-11
|
|
can convince the
|
|
.Tn DH-11
|
|
autoconfiguration code that it is a
|
|
.Tn DH-11 .
|
|
.Pp
|
|
The 4 40-way cables are a pain.
|
|
.Sh SEE ALSO
|
|
.Xr tty 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver appeared in
|
|
.Bx 4.3 .
|
|
.br
|
|
A new
|
|
.Nm
|
|
driver showed up in
|
|
.Bx 1.2 .
|
|
.Sh BUGS
|
|
Even if the
|
|
.Nm
|
|
hardware supports
|
|
.Tn DMA ,
|
|
the driver cannot make use of this capability.
|