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BSD 2.11 - man page for acc (bsd section 4)

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ACC(4)											   ACC(4)

NAME
       acc - ACC LH/DH IMP interface

SYNOPSIS
       /sys/conf/SYSTEM:
	    NACC 0    # ACC LH/DH ARPAnet IMP interface
	    PLI  YES  # LH/DH is connected to a PLI

DESCRIPTION
       The  acc  device  provides  a Local Host/Distant Host interface to an IMP.  It is normally
       used when participating in the DARPA Internet.  The controller itself is not accessible to
       users, but instead provides the hardware support to the IMP interface described in imp(4).
       When configuring, the imp(NIMP) 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	register).   This
       should never happen as the maximum size of a host-IMP message is 1008 bytes.

3rd Berkeley Distribution		  July 26, 1987 				   ACC(4)
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