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+.\"
+.\" Copyright (c) 1996, 1997 Jonathan Stone.
+.\" All rights reserved.
+.\"
+.\" 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 Jonathan Stone.
+.\" 3. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+.\"
+.\"	$NetBSD: tc.4,v 1.3 1997/11/08 07:27:55 jonathan Exp $
+.\"	$OpenBSD: tc.4,v 1.1 1998/03/09 15:35:52 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt TC 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm tc
+.Nd
+TurboChannel SCSI adaptor
+.Sh SYNOPSIS
+.Cd "tc? at mainbus"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the DEC TurboChannel expansion
+bus on DECstation 5000 series machines. TurboChannel is a 32-bit wide
+synchronous DMA-capable bus, running at 25 Mhz on higher-end machines
+and at 12.5MHz on lower-end machines.
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr asc 4 ,
+.Xr ioasic 4 ,
+.Xr le 4 ,
+.Xr cfb 4 ,
+.Xr sfb 4 ,
+.Xr mfb 4 ,
+.Xr px 4 .
+.Sh HISTORY
+The
+.Nm
+driver
+first appeared in
+.Nx 1.1 .
+.Sh BUGS
+.Pp
+The
+.Nm
+driver makes poor use of interrupt priority on the 5000/1xx
+series.