1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)acc.4 8.1 (Berkeley) 06/05/93 7.\" 8.Dd 9.Dt ACC 4 vax 10.Os BSD 4.2 11.Sh NAME 12.Nm acc 13.Nd 14.Tn ACC LH/DH IMP 15interface 16.Sh SYNOPSIS 17.Cd pseudo-device imp "device acc0 at uba0 csr 167600 vector accrint accxint" 18.Sh DESCRIPTION 19The 20.Nm acc 21device provides a Local Host/Distant Host 22interface to an 23.Tn IMP . 24It is normally used when participating 25in the 26.Tn DARPA 27Internet. The controller itself is not accessible 28to users, but instead provides the hardware support to the 29.Tn IMP 30interface described in 31.Xr imp 4 . 32The configuration entry for the 33.Xr imp 34must also include the 35.Em pseudo-device 36as shown above. 37.Sh DIAGNOSTICS 38.Bl -diag 39.It acc%d: not alive. 40The initialization routine was entered even though the device 41did not autoconfigure. This indicates a system problem. 42.Pp 43.It acc%d: can't initialize. 44Insufficient UNIBUS resources existed to initialize the device. 45This is likely to occur when the device is run on a buffered 46data path on an 11/750 and other network interfaces are also 47configured to use buffered data paths, or when it is configured 48to use buffered data paths on an 11/730 (which has none). 49.Pp 50.It acc%d: imp doesn't respond, icsr=%b. 51The driver attempted to initialize the device, but the 52.Tn IMP 53failed to respond after 500 tries. Check the cabling. 54.Pp 55.It acc%d: stray xmit interrupt, csr=%b. 56An interrupt occurred when no output had previously been started. 57.Pp 58.It acc%d: output error, ocsr=%b, icsr=%b. 59The device indicated a problem sending data on output. 60.Pp 61.It acc%d: input error, csr=%b. 62The device indicated a problem receiving data on input. 63.Pp 64.It acc%d: bad length=%d. 65An input operation resulted in a data transfer of less than 660 or more than 1008 bytes of 67data into memory (according to the word count register). 68This should never happen as the maximum size of a 69.Pf host- Tn IMP 70message is 1008 bytes. 71.El 72.Sh SEE ALSO 73.Xr netintro 4 74.Sh HISTORY 75The 76.Nm 77interface appeared in 78.Bx 4.2 . 79