NAME
acc —
ACC LH/DH IMP network
interface
SYNOPSIS
pseudo-device imp acc0 at uba0 csr 167600 vector accrint
accxint
DESCRIPTION
NOTE: At the moment
NetBSD does not support IMP, so this
manual page is not relevant.
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). The configuration entry
for the
imp(4) must also include
the
pseudo-device as shown above.
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.
SEE ALSO
netintro(4)
HISTORY
The
acc interface appeared in
4.2BSD.