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+.\"	$NetBSD: rtfps.4,v 1.9 2003/08/07 10:31:03 agc 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. 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: Id: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp
+.\"
+.Dd August 7, 1994
+.Dt RTFPS 4
+.Os
+.Sh NAME
+.Nm rtfps
+.Nd multiplexing serial communications interface
+.Sh SYNOPSIS
+.Cd "rtfps0 at isa? port 0x1230 irq 10"
+.Cd "com2 at rtfps0 slave 0"
+.Cd "com3 at rtfps0 slave 1"
+.Cd "com4 at rtfps0 slave 2"
+.Cd "com5 at rtfps0 slave 3"
+.Sh DESCRIPTION
+The
+.Nm rtfps
+driver provides support for IBM RT PC boards that multiplex together up to four
+.Tn EIA
+.Tn RS-232C
+.Pf ( Tn CCITT
+.Tn V.28 )
+or
+.Tn RS-422A
+communications interfaces.
+.Pp
+Each
+.Nm
+device is the master device for up to four
+.Nm com
+devices.  The kernel configuration specifies these
+.Nm com
+devices as slave devices of the
+.Nm
+device, as shown in the synopsis.
+The
+.Tn port
+specification for the
+.Nm
+device is used to compute the base addresses for the
+.Nm com
+subdevices.
+.Sh FILES
+.Bl -tag -width Pa
+.It Pa /dev/tty0?
+.El
+.Sh SEE ALSO
+.Xr com 4
+.Sh HISTORY
+The
+.Nm
+driver was written by Charles Hannum, based on the
+.Nm ast
+driver.
+.Sh BUGS
+The
+.Nm
+driver is unlikely to work on non-EISA and non-PCI machines.  The ISA
+bus only asserts 10 I/O address lines, and this is not enough.
+.Pp
+Even on EISA and PCI machines, some address conflicts have been observed.
+On one machine, the second port always conflicted with something (though
+it's not clear what) and caused strange results.  Disabling the second
+port in the kernel config allowed the other three ports to function
+correctly.