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DECnet-20 Beware File
COPYRIGHT (C) 1976,1977,1978,1979,1980,1981,1982 BY DIGITAL EQUIPMENT
CORPORATION, MAYNARD, MASS.
THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED
AND COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE
AND WITH THE INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS
SOFTWARE OR ANY OTHER COPIES THEREOF MAY NOT BE PROVIDED OR
OTHERWISE MADE AVAILABLE TO ANY OTHER PERSON. NO TITLE TO
AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE
WITHOUT NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT
BY DIGITAL EQUIPMENT CORPORATION.
DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY
OF ITS SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY
This document supplements the DECnet-20 manuals by pointing
out hints and potential problems discovered at the last
2.0 Installation information
2.1 New OPR Required
The TOPS-20 tape shipped with this release includes a field-image
ver.4.0 OPR.EXE built with the DECnet Phase III NCP command set.
The NCP commands have changed from Phase II DECnet. To get the new
command set you must either: 1/ re-link OPR with the new NCPTAB.REL
supplied in this release, if you are running a patched version of
OPR.REL and wish to keep it, or 2/ use the field-image OPR on the
TOPS20 tape. If you choose the first option, refer to the directions
given for building the GALAXY components in the TOPS-20 Software
Installation Guide, and do the following additional steps:
-Locate the old NCPTAB.REL in a directory specified in GALAXY's DSK:
-Save a copy of the old NCPTAB.REL in another directory until you are
satisfied with the new release.
-Replace the old NCPTAB.REL with the NCPTAB.REL supplied on the DECnet
tape in the PS:<SUBSYS> saveset.
-Submit GALAXY.CTL to rebuild OPR. (Note that you may only need to
submit OPERAT.CTL, which rebuilds OPR. GALAXY.CTL submits files to
rebuild the whole GALAXY system.)
2.2 Upgrading From A Previous Release
Note that if you are upgrading to TOPS-20 5.1 from a previously
installed TOPS-20 or TOPS-20+DECnet, be sure you follow the convention
of using <NEW-SYSTEM> and <NEW-SUBSYS> in place of <SYSTEM> and
<SUBSYS> directories, and that you define the system-wide logical names
in the TOPS-20 configuration file as follows:
define SYS: PS:<NEW-SUBSYS>,PS:<SUBSYS>
define SYSTEM: PS:<NEW-SYSTEM>,PS:<SYSTEM>
Be sure to keep the previous systems (TOPS-20 and DECnet) in the old
directories until you are satisfied with ALL of the new release.
2.3 NETGEN Program
The number of nodes in the network must be greater than or equal to the
highest node address you plan to talk to. If it is lower than the node
address of the node you are configuring, the DN20 load will fail with a
LOAD FAILED, Protocol Initialization Failed,
Protocol Initialization Failed
The maximum network size Digital supports is 32 nodes. They do not need
to be numbered (have addresses) 2-34(10). Node addresses are used as
table-lookup indices; note that the higher the number of nodes in the
net, the more space is taken in your system image by unused node
entries in tables.
2.4 Data Link Block Size (Buffer Size) in the monitor
All buffers in a DECnet network must be the same size; if any node's
buffer size is different, that node will be unable to communicate with
any other node in the network. The monitors included on the TOPS20
distribution tape were built with a fixed data link block size. If
your buffer size is not 576. (1100 octal) you must patch the monitor
you run as folows:
NODINI+30/ MOVEI T2,JSTAB+100 movei T2,n1
where JSTAB+100 represents the built-in data link block size and n1 is
the size your network uses.