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-.\" $OpenBSD: com.4,v 1.7 1999/11/28 12:29:00 downsj Exp $
-.\" $NetBSD: com.4,v 1.5 1996/03/16 00:07:08 thorpej Exp $
-.\"
-.\" 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
-.\"
-.Dd July 12, 1998
-.Dt COM 4 i386
-.Os
-.Sh NAME
-.Nm com
-.Nd
-serial communications interface
-.Sh SYNOPSIS
-.Cd "com0 at isa? port" \&"IO_COM1\&" irq 4
-.Cd "com1 at isa? port" \&"IO_COM2\&" irq 3
-.Pp
-.Cd "pccom0 at isa? port" \&"IO_COM1\&" irq 4
-.Cd "pccom1 at isa? port" \&"IO_COM2\&" irq 3
-.Cd "pccom* at isapnp?"
-.Sh DESCRIPTION
-The
-.Nm com
-and
-.Nm pccom
-drivers provide support for NS8250-, NS16450-, NS16550-, ST16650-, and
-TI16750-based
-.Tn EIA
-.Tn RS-232C
-.Pf ( Tn CCITT
-.Tn V.28 )
-communications interfaces.
-The
-.Nm pccom
-driver also supports the XR16850 UART.
-.Pp
-The NS8250 and NS16450 have single
-character buffers, the NS16550 has a 16 character buffer, while
-the ST16650 has a 32 character buffer, and the TI16750 has a 64 character
-buffer. The XR16850 has a 128 character buffer.
-.Pp
-The
-.Nm com
-and
-.Nm pccom
-drivers are mutually exclusive; both may not be present in the same system at
-the same time. Attempting to compile such a system will fail.
-.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, 57600, or 115200, or any other baud rate which is a factor
-of 115200.
-.Sh FILES
-.Bl -tag -width Pa
-.It Pa /dev/tty00
-.It Pa /dev/tty01
-.It Pa /dev/cua00
-.It Pa /dev/cua01
-.El
-.Sh DIAGNOSTICS
-.Bl -diag
-.It com%d: %d silo overflows
-The input
-.Dq silo
-has overflowed and incoming data has been lost.
-.It com%d: weird interrupt: iir=%x
-The device has generated an unexpected interrupt
-with the code listed.
-.El
-.Sh SEE ALSO
-.Xr ast 4 ,
-.Xr rtfps 4 ,
-.Xr tty 4
-.Sh HISTORY
-The
-.Nm
-driver was originally derived from the
-.Nm HP9000/300
-.Nm dca
-driver and is
-.Ud
-.Sh BUGS
-Data loss is possible on busy systems with unbuffered UARTs at high speed.
-.Pp
-The name of this driver and the constants which define the locations
-of the various serial ports are holdovers from
-.Nm DOS .