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+.\" Copyright (c) 1983, 1991 Regents of the University of California.
+.\" 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 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: @(#)css.4	6.2 (Berkeley) 3/27/91
+.\"	$Id: css.4,v 1.1 1995/10/18 08:44:33 deraadt Exp $
+.\"
+.Dd March 27, 1991
+.Dt CSS 4 vax
+.Os BSD 4.2
+.Sh NAME
+.Nm css
+.Nd
+.Tn DEC IMP-11A LH/DH IMP
+interface
+.Sh SYNOPSIS
+.Cd "pseudo-device imp device css0 \&at uba0 csr 167600 flags 10 vector cssrint cssxint"
+.Sh DESCRIPTION
+The 
+.Nm css
+device provides a Local Host/Distant Host
+interface to an
+.Tn IMP .
+It is normally used when participating
+in the
+.Tn DARPA
+Internet.  The controller itself is not accessible
+to users, but instead provides the hardware support to the
+.Tn IMP
+interface described in
+.Xr imp 4 .
+The configuration entry for the
+.Xr imp
+must also include the
+.Em pseudo-device
+as shown above.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It css%d: not alive.
+The initialization routine was entered even though the device
+did not autoconfigure.  This is indicates a system problem.
+.Pp
+.It css%d: can't initialize.
+Insufficient
+.Tn UNIBUS
+resources existed to initialize the device.
+This is likely to occur when the device is run on a buffered
+data path on an 11/750 and other network interfaces are also
+configured to use buffered data paths, or when it is configured
+to use buffered data paths on an 11/730 (which has none).
+.Pp
+.It css%d: imp doesn't respond, icsr=%b.
+The driver attempted to initialize the device, but the
+.Tn IMP
+failed to respond after 500 tries.  Check the cabling.
+.Pp
+.It css%d: stray output interrupt csr=%b.
+An interrupt occurred when no output had previously been started. 
+.Pp
+.It css%d: output error, ocsr=%b icsr=%b.
+The device indicated a problem sending data on output.
+.Pp
+.It css%d: recv error, csr=%b.
+The device indicated a problem receiving data on input.
+.Pp
+.It css%d: bad length=%d.
+An input operation resulted in a data transfer of less than
+0 or more than 1008 bytes of
+data into memory (according to the word count register).
+This should never happen as the maximum size of a
+.Pf host- Tn IMP
+message is 1008 bytes.
+.El
+.Sh HISTORY
+The
+.Nm
+interface appeared in
+.Bx 4.2 .