1.\" Copyright (c) 1983, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)css.4 6.2 (Berkeley) 03/27/91 7.\" 8.Dd 9.Dt CSS 4 vax 10.Os BSD 4.2 11.Sh NAME 12.Nm css 13.Nd 14.Tn DEC IMP-11A LH/DH IMP 15interface 16.Sh SYNOPSIS 17.Cd "pseudo-device imp device css0 \&at uba0 csr 167600 flags 10 vector cssrint cssxint" 18.Sh DESCRIPTION 19The 20.Nm css 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 css%d: not alive. 40The initialization routine was entered even though the device 41did not autoconfigure. This is indicates a system problem. 42.Pp 43.It css%d: can't initialize. 44Insufficient 45.Tn UNIBUS 46resources existed to initialize the device. 47This is likely to occur when the device is run on a buffered 48data path on an 11/750 and other network interfaces are also 49configured to use buffered data paths, or when it is configured 50to use buffered data paths on an 11/730 (which has none). 51.Pp 52.It css%d: imp doesn't respond, icsr=%b. 53The driver attempted to initialize the device, but the 54.Tn IMP 55failed to respond after 500 tries. Check the cabling. 56.Pp 57.It css%d: stray output interrupt csr=%b. 58An interrupt occurred when no output had previously been started. 59.Pp 60.It css%d: output error, ocsr=%b icsr=%b. 61The device indicated a problem sending data on output. 62.Pp 63.It css%d: recv error, csr=%b. 64The device indicated a problem receiving data on input. 65.Pp 66.It css%d: bad length=%d. 67An input operation resulted in a data transfer of less than 680 or more than 1008 bytes of 69data into memory (according to the word count register). 70This should never happen as the maximum size of a 71.Pf host- Tn IMP 72message is 1008 bytes. 73.El 74.Sh HISTORY 75The 76.Nm 77interface appeared in 78.Bx 4.2 . 79