1.\" $NetBSD: acc.4,v 1.3 1996/03/03 17:13:10 thorpej Exp $ 2.\" 3.\" Copyright (c) 1983, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)acc.4 6.4 (Berkeley) 3/27/91 35.\" 36.Dd March 27, 1991 37.Dt ACC 4 vax 38.Os BSD 4.2 39.Sh NAME 40.Nm acc 41.Nd 42.Tn ACC LH/DH IMP 43interface 44.Sh SYNOPSIS 45.Cd pseudo-device imp "device acc0 at uba0 csr 167600 vector accrint accxint" 46.Sh DESCRIPTION 47The 48.Nm acc 49device provides a Local Host/Distant Host 50interface to an 51.Tn IMP . 52It is normally used when participating 53in the 54.Tn DARPA 55Internet. The controller itself is not accessible 56to users, but instead provides the hardware support to the 57.Tn IMP 58interface described in 59.Xr imp 4 . 60The configuration entry for the 61.Xr imp 62must also include the 63.Em pseudo-device 64as shown above. 65.Sh DIAGNOSTICS 66.Bl -diag 67.It acc%d: not alive. 68The initialization routine was entered even though the device 69did not autoconfigure. This indicates a system problem. 70.Pp 71.It acc%d: can't initialize. 72Insufficient UNIBUS resources 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 acc%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 acc%d: stray xmit interrupt, csr=%b. 84An interrupt occurred when no output had previously been started. 85.Pp 86.It acc%d: output error, ocsr=%b, icsr=%b. 87The device indicated a problem sending data on output. 88.Pp 89.It acc%d: input error, csr=%b. 90The device indicated a problem receiving data on input. 91.Pp 92.It acc%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 SEE ALSO 101.Xr netintro 4 102.Sh HISTORY 103The 104.Nm 105interface appeared in 106.Bx 4.2 . 107