99 lines
3.5 KiB
Groff
99 lines
3.5 KiB
Groff
|
.\" Copyright (c) 1990, 1991 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. 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: @(#)dca.4 5.2 (Berkeley) 3/27/91
|
||
|
|
.\" $Id: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp $
|
||
|
|
.\"
|
||
|
|
.Dd August 6, 1993
|
||
|
|
.Dt COM 4 i386
|
||
|
|
.Os NetBSD 0.8a
|
||
|
|
.Sh NAME
|
||
|
|
.Nm com
|
||
|
|
.Nd
|
||
|
|
serial communications interface
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.Cd "device com0 at isa? port" \&"IO_COM1\&" tty irq 4 vector comintr
|
||
|
|
.Cd "device com1 at isa? port" \&"IO_COM2\&" tty irq 3 vector comintr
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Nm com
|
||
|
|
driver provides support for NS8250-, NS16450-, and NS16550-based
|
||
|
|
.Tn EIA
|
||
|
|
.Tn RS-232C
|
||
|
|
.Pf ( Tn CCITT
|
||
|
|
.Tn V.28 )
|
||
|
|
communications interfaces. The NS8250 and NS16450 have single character
|
||
|
|
buffers, and the NS16550 has a 16 character buffer.
|
||
|
|
.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, or 57600.
|
||
|
|
.Sh FILES
|
||
|
|
.Bl -tag -width Pa
|
||
|
|
.It Pa /dev/tty00
|
||
|
|
.It Pa /dev/tty01
|
||
|
|
.El
|
||
|
|
.Sh DIAGNOSTICS
|
||
|
|
.Bl -diag
|
||
|
|
.It com%d: silo overflow.
|
||
|
|
The single-character input
|
||
|
|
.Dq silo
|
||
|
|
has overflowed and incoming data has been lost.
|
||
|
|
.It com%d: weird interrupt: %x.
|
||
|
|
The device has generated an unexpected interrupt
|
||
|
|
with the code listed.
|
||
|
|
.El
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr tty 4
|
||
|
|
.Sh HISTORY
|
||
|
|
The
|
||
|
|
.Nm
|
||
|
|
driver is derived from the
|
||
|
|
.Nm HP9000/300
|
||
|
|
.Nm dca
|
||
|
|
driver and is
|
||
|
|
.Ud
|
||
|
|
.Sh BUGS
|
||
|
|
Data loss is possible on busy systems with baud rates greater than 300.
|
||
|
|
The
|
||
|
|
.Nm com
|
||
|
|
driver is slow, buggy, and not properly tested.
|
||
|
|
.Pp
|
||
|
|
The name of this driver and the constants which define the locations
|
||
|
|
of the various seiral ports are holdovers from
|
||
|
|
.Nm DOS .
|
||
|
|
.Pp
|
||
|
|
As usual, you get what you pay for; cheap NS16550 clones
|
||
|
|
generally don't work.
|