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author | rgrimes <rgrimes@FreeBSD.org> | 1993-08-28 12:41:23 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1993-08-28 12:41:23 +0000 |
commit | 7a6447606ece0618edfebfa7be684f86c6265bba (patch) | |
tree | cbb32281c1f1ac4b01f626303f1113e206c41918 /share/man/man4/man4.i386/com.4 | |
parent | 76c1049755148310b27c1ea06158f4328db902f7 (diff) | |
download | FreeBSD-src-7a6447606ece0618edfebfa7be684f86c6265bba.zip FreeBSD-src-7a6447606ece0618edfebfa7be684f86c6265bba.tar.gz |
New manual pages from NetBSD, revised for FreeBSD slightly
Diffstat (limited to 'share/man/man4/man4.i386/com.4')
-rw-r--r-- | share/man/man4/man4.i386/com.4 | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/share/man/man4/man4.i386/com.4 b/share/man/man4/man4.i386/com.4 new file mode 100644 index 0000000..4e45bab --- /dev/null +++ b/share/man/man4/man4.i386/com.4 @@ -0,0 +1,102 @@ +.\" 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 +.\" from: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp +.\" $Id$ +.\" +.Dd August 28, 1993 +.Dt COM 4 i386 +.Os FreeBSD +.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 +.Cd "device com2 at isa? port" \&"IO_COM3\&" tty irq 5 vector comintr +.Cd "device com3 at isa? port" \&"IO_COM4\&" tty irq 9 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, 57600, or 115200. +.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 +.Xr sio 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. |