1.\" Copyright (c) 1983, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)css.4 6.2 (Berkeley) 3/27/91 33.\" 34.Dd March 27, 1991 35.Dt CSS 4 vax 36.Os BSD 4.2 37.Sh NAME 38.Nm css 39.Nd 40.Tn DEC IMP-11A LH/DH IMP 41interface 42.Sh SYNOPSIS 43.Cd "pseudo-device imp device css0 \&at uba0 csr 167600 flags 10 vector cssrint cssxint" 44.Sh DESCRIPTION 45The 46.Nm css 47device provides a Local Host/Distant Host 48interface to an 49.Tn IMP . 50It is normally used when participating 51in the 52.Tn DARPA 53Internet. The controller itself is not accessible 54to users, but instead provides the hardware support to the 55.Tn IMP 56interface described in 57.Xr imp 4 . 58The configuration entry for the 59.Xr imp 60must also include the 61.Em pseudo-device 62as shown above. 63.Sh DIAGNOSTICS 64.Bl -diag 65.It css%d: not alive. 66The initialization routine was entered even though the device 67did not autoconfigure. This is indicates a system problem. 68.Pp 69.It css%d: can't initialize. 70Insufficient 71.Tn UNIBUS 72resources existed to initialize the device. 73This is likely to occur when the device is run on a buffered 74data path on an 11/750 and other network interfaces are also 75configured to use buffered data paths, or when it is configured 76to use buffered data paths on an 11/730 (which has none). 77.Pp 78.It css%d: imp doesn't respond, icsr=%b. 79The driver attempted to initialize the device, but the 80.Tn IMP 81failed to respond after 500 tries. Check the cabling. 82.Pp 83.It css%d: stray output interrupt csr=%b. 84An interrupt occurred when no output had previously been started. 85.Pp 86.It css%d: output error, ocsr=%b icsr=%b. 87The device indicated a problem sending data on output. 88.Pp 89.It css%d: recv error, csr=%b. 90The device indicated a problem receiving data on input. 91.Pp 92.It css%d: bad length=%d. 93An input operation resulted in a data transfer of less than 940 or more than 1008 bytes of 95data into memory (according to the word count register). 96This should never happen as the maximum size of a 97.Pf host- Tn IMP 98message is 1008 bytes. 99.El 100.Sh HISTORY 101The 102.Nm 103interface appeared in 104.Bx 4.2 . 105