acc man page on Ultrix

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acc(4)				  Unsupported				acc(4)

Name
       acc - ACC LH/DH IMP interface

Syntax
       pseudo-device imp
       device acc0 at uba0 csr 0167600 vector accrint accxint

Description
       The  device provides a Local Host/Distant Host interface to an IMP.  It
       is normally used when participating in the DARPA	 Internet.   The  con‐
       troller	itself	is  not	 accessible to users, but instead provides the
       hardware support to the IMP interface described	in  When  configuring,
       the pseudo-device must also be included.

Diagnostics
       acc%d: not alive.
       The  initialization  routine was entered even though the device did not
       autoconfigure.  This indicates a system problem.

       acc%d: can't initialize.
       Insufficient UNIBUS resources existed to initialize the	device.	  This
       is likely to occur when the device is run on a buffered data path on an
       11/750 and other network interfaces are also configured to use buffered
       data  paths,  or when it is configured to use buffered data paths on an
       11/730 (which has none).

       acc%d: imp doesn't respond, icsr=%b.
       The driver attempted to initialize the device, but the  IMP  failed  to
       respond after 500 tries.	 Check the cabling.

       acc%d: stray xmit interrupt, csr=%b.
       An interrupt occurred when no output had previously been started.

       acc%d: output error, ocsr=%b, icsr=%b.
       The device indicated a problem sending data on output.

       acc%d: input error, csr=%b.
       The device indicated a problem receiving data on input.

       acc%d: bad length=%d.
       An  input  operation resulted in a data transfer of less than 0 or more
       than 1008 bytes of data into memory (according to the word count regis‐
       ter).   This should never happen as the maximum size of a host-IMP mes‐
       sage is 1008 bytes.

				      VAX				acc(4)
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