104 lines
3.5 KiB
Groff
104 lines
3.5 KiB
Groff
.\"
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.\" Copyright (c) 1990, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Systems Programming Group of the University of Utah Computer
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.\" Science Department.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91
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.\" from: Id: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp
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.\" $Id: rtfps.4,v 1.4 1995/02/17 09:43:49 jtc Exp $
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.\"
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.Dd August 7, 1994
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.Dt RTFPS 4 i386
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.Os NetBSD 1.0
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.Sh NAME
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.Nm rtfps
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.Nd
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multiplexing serial communications interface
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.Sh SYNOPSIS
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.Cd "rtfps0 at isa? port 0x1230 irq 10"
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.Cd "com2 at rtfps0 slave 0"
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.Cd "com3 at rtfps0 slave 1"
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.Cd "com4 at rtfps0 slave 2"
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.Cd "com5 at rtfps0 slave 3"
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.Sh DESCRIPTION
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The
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.Nm rtfps
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driver provides support for IBM RT PC boards that multiplex together up to four
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.Rn EIA
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.Tn RS-232C
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.Pf ( Tn CCITT
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.Tn V.28 )
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or
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.Tn RS-422A
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communications interfaces.
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.Pp
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Each
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.Nm
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device is the master device for up to four
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.Nm com
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devices. The kernel configuration specifies these
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.Nm com
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devices as slave devices of the
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.Nm
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device, as shown in the synopsis.
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The
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.Tn port
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specification for the
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.Nm
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device is used to compute the base addresses for the
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.Nm com
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subdevices.
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.Sh FILES
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.Bl -tag -width Pa
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.It Pa /dev/tty0?
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.El
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.Sh SEE ALSO
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.Xr com 4
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.Sh HISTORY
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The
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.Nm
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driver was written by Charles Hannum, based on the
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.Nm ast
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driver.
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.Sh BUGS
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The
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.Nm
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driver is unlikely to work on non-EISA and non-PCI machines. The ISA
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bus only asserts 10 I/O address lines, and this is not enough.
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.Pp
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Even on EISA and PCI machines, some address conflicts have been observed.
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On one machine, the second port always conflicted with something (though
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it's not clear what) and caused strange results. Disabling the second
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port in the kernel config allowed the other three ports to function
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correctly.
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