1.\" Copyright (c) 1983, 1991 The 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.\" from: @(#)acc.4 6.4 (Berkeley) 3/27/91 33.\" $Id: acc.4,v 1.2 1993/08/01 07:36:39 mycroft Exp $ 34.\" 35.Dd March 27, 1991 36.Dt ACC 4 vax 37.Os BSD 4.2 38.Sh NAME 39.Nm acc 40.Nd 41.Tn ACC LH/DH IMP 42interface 43.Sh SYNOPSIS 44.Cd pseudo-device imp "device acc0 at uba0 csr 167600 vector accrint accxint" 45.Sh DESCRIPTION 46The 47.Nm acc 48device provides a Local Host/Distant Host 49interface to an 50.Tn IMP . 51It is normally used when participating 52in the 53.Tn DARPA 54Internet. The controller itself is not accessible 55to users, but instead provides the hardware support to the 56.Tn IMP 57interface described in 58.Xr imp 4 . 59The configuration entry for the 60.Xr imp 61must also include the 62.Em pseudo-device 63as shown above. 64.Sh DIAGNOSTICS 65.Bl -diag 66.It acc%d: not alive. 67The initialization routine was entered even though the device 68did not autoconfigure. This indicates a system problem. 69.Pp 70.It acc%d: can't initialize. 71Insufficient UNIBUS resources existed to initialize the device. 72This is likely to occur when the device is run on a buffered 73data path on an 11/750 and other network interfaces are also 74configured to use buffered data paths, or when it is configured 75to use buffered data paths on an 11/730 (which has none). 76.Pp 77.It acc%d: imp doesn't respond, icsr=%b. 78The driver attempted to initialize the device, but the 79.Tn IMP 80failed to respond after 500 tries. Check the cabling. 81.Pp 82.It acc%d: stray xmit interrupt, csr=%b. 83An interrupt occurred when no output had previously been started. 84.Pp 85.It acc%d: output error, ocsr=%b, icsr=%b. 86The device indicated a problem sending data on output. 87.Pp 88.It acc%d: input error, csr=%b. 89The device indicated a problem receiving data on input. 90.Pp 91.It acc%d: bad length=%d. 92An input operation resulted in a data transfer of less than 930 or more than 1008 bytes of 94data into memory (according to the word count register). 95This should never happen as the maximum size of a 96.Pf host- Tn IMP 97message is 1008 bytes. 98.El 99.Sh SEE ALSO 100.Xr netintro 4 101.Sh HISTORY 102The 103.Nm 104interface appeared in 105.Bx 4.2 . 106