1CSS(4)                     Kernel Interfaces Manual                     CSS(4)
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NAME

6       css - DEC IMP-11A LH/DH IMP interface
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SYNOPSIS

9       /sys/conf/SYSTEM:
10            NCSS css_controllers     # DEC/CSS IMP11-A ARPAnet IMP interface
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DESCRIPTION

13       The  css device provides a Local Host/Distant Host interface to an IMP.
14       It is normally used when participating in the DARPA Internet.  The con‐
15       troller  itself  is  not  accessible to users, but instead provides the
16       hardware support to the IMP interface described in imp(4).   When  con‐
17       figuring, the imp(NIMP) pseudo-device is also included.
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DIAGNOSTICS

20       css%d:  not  alive.  The initialization routine was entered even though
21       the device did not autoconfigure.  This is indicates a system problem.
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23       css%d: can't initialize.  Insufficient UNIBUS resources existed to ini‐
24       tialize  the device.  This is likely to occur when the device is run on
25       a buffered data path on an 11/750 and other network interfaces are also
26       configured  to use buffered data paths, or when it is configured to use
27       buffered data paths on an 11/730 (which has none).
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29       css%d: imp doesn't respond, icsr=%b.  The driver attempted to  initial‐
30       ize  the  device, but the IMP failed to respond after 500 tries.  Check
31       the cabling.
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33       css%d: stray output interrupt csr=%b.  An interrupt  occurred  when  no
34       output had previously been started.
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36       css%d:  output  error, ocsr=%b icsr=%b.  The device indicated a problem
37       sending data on output.
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39       css%d: recv error, csr=%b.  The device indicated  a  problem  receiving
40       data on input.
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42       css%d:  bad  length=%d.  An input operation resulted in a data transfer
43       of less than 0 or more than 1008 bytes of data into  memory  (according
44       to  the  word count register).  This should never happen as the maximum
45       size of a host-IMP message is 1008 bytes.
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493rd Berkeley Distribution       August 20, 1987                         CSS(4)
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