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                        DECnet-20 Beware File


				April, 1982


                          PHASE III







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
DIGITAL.

                                                      Page 2





1.0 INTRODUCTION

1.1 Function

This document supplements the DECnet-20  manuals  by  pointing
out  hints  and  potential  problems  discovered at the last
minute.



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:
	  search list.
	 -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
	message like
		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:
		@GET MONITR.EXE
		@DDT
		DDT
		NODINI+30/	MOVEI  T2,JSTAB+100	movei T2,n1
		^C
		@SAVE
		@
	where JSTAB+100 represents the built-in data link block size and n1 is
	the size your network uses.

3.0 Software