acc(4) Unsupported acc(4)Nameacc - ACC LH/DH IMP interface
device acc0 at uba0 csr 0167600 vector accrint accxint
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.
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.