.\" SCCSID: @(#)css.4	8.1	9/11/90.TH css 4 VAX "" Unsupported.SH Namecss \- DEC IMP-11A LH/DH IMP interface.SH Syntax.B "pseudo-device imp".br.B "device css0 at uba0 csr 0167600 flags 10 vector cssrint cssxint".SH DescriptionThe .PN cssdevice provides a Local Host/Distant Hostinterface to an IMP.  It is normally used when participatingin the DARPA Internet.  The controller itself is not accessibleto users, but instead provides the hardware support to the IMPinterface described in.MS imp 4 .When configuring, the .PN imppseudo-device is also included..SH Diagnostics.BR "css%d: not alive" ..brThe initialization routine was entered even though the devicedid not autoconfigure.  This is indicates a system problem..PP.BR "css%d: can't initialize" ..brInsufficient UNIBUS resources existed to initialize the device.This is likely to occur when the device is run on a buffereddata path on an 11/750 and other network interfaces are alsoconfigured to use buffered data paths, or when it is configuredto use buffered data paths on an 11/730 (which has none)..PP.BR "css%d: imp doesn't respond, icsr=%b" ..brThe driver attempted to initialize the device, but the IMPfailed to respond after 500 tries.  Check the cabling..PP.BR "css%d: stray output interrupt csr=%b" ..brAn interrupt occurred when no output had previously been started. .PP.BR "css%d: output error, ocsr=%b icsr=%b" ..brThe device indicated a problem sending data on output..PP.BR "css%d: recv error, csr=%b" ..brThe device indicated a problem receiving data on input..PP.BR "css%d: bad length=%d" ..brAn input operation resulted in a data transfer of less than0 or more than 1008 bytes ofdata into memory (according to the word count register).This should never happen as the maximum size of a host-IMPmessage is 1008 bytes.