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               BEWARE FILE FOR DN64 SOFTWARE










                        Revision:  2
                      Date:  29 Feb 80










                       Copyright (c) 1980, 1979
            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.
BEWARE FILE FOR DN64 WITH TOPS20 RELEASE 4.0                    Page 2
TABLE OF CONTENTS


                          TABLE OF CONTENTS




     1.  PURPOSE

     2.  LIST OF FILES INCLUDED IN DN64 RELEASE FOR 4.0

     3.  INSTALLATION INSTRUCTIONS

     4.  WARNINGS OF KNOWN DEFICIENCIES

     5.  DEPENDENCIES
BEWARE FILE FOR DN64 WITH TOPS20 RELEASE 4.0                    Page 3
PURPOSE


1.0  PURPOSE



The IBM  2780/3780/HASP  Emulation  and  Termination  software  is  an
enhanced successor to the DN64 software.

This software includes support for GALAXY  and  TOPS-20  release  4.0.
The  operator  interface  has  now  been  integrated  with  the  other
spoolers, providing for more uniform operating procedures.
BEWARE FILE FOR DN64 WITH TOPS20 RELEASE 4.0                    Page 4
LIST OF FILES INCLUDED IN DN64 RELEASE FOR TOPS-20 RELEASE 4.0


2.0  LIST OF FILES INCLUDED IN DN64 RELEASE FOR TOPS-20 RELEASE 4.0



The files included in the DN64 release  for  TOPS20  release  4.0  are
listed and described in the DN64 installation manual.

The files consist of two types:

     1.  Spooler and Support files

     2.  Front End files



The Spooler and Support files reside in the DECSystem-20 and run under
the TOPS20 4.0 operating system.

The Front End files are assembled to produce  the  DN64  Communication
Software.  This software resides in the Front End.
BEWARE FILE FOR DN64 WITH TOPS20 RELEASE 4.0                    Page 5
INSTALLATION INSTRUCTIONS


3.0  INSTALLATION INSTRUCTIONS



The  installation  instructions  and  procedures  are   described   in
DECSystem-10  (TOPS-20)  DN65 Installation Manual.  Consult the manual
for a complete description of the process.

The manual may be ordered by asking for:


        IBM Emulation/Termination
        DN65:2780/3780/HASP
        AA-5095B-TM

Current  users  of  the  DN64  should  note  that   the   installation
instructions  have  changed substantially since the last release.  The
D60SPL program has been replaced by integrated support in  LPTSPL  and
CDRIVE, plus a new spooler called IBMSPL.
BEWARE FILE FOR DN64 WITH TOPS20 RELEASE 4.0                    Page 6
WARNINGS OF KNOWN DEFICIENCIES


4.0  WARNINGS OF KNOWN DEFICIENCIES



This  list  of  deficiencies   is   divided   into   three   sections:
Termination,  Emulation  and  General.   The  Termination  section  is
applicable to sites that run the DN64 software  in  termination  mode.
The  Emulation  section  applies sites running in emulation mode.  The
General section applies to both, begin deficiencies that reside  under
either termination or emulation.



4.1  Termination


      o  If a termination station is running, a file is  being  output
         and  the  line  drops  the  state  of the lineprinter goes to
         OFFLINE.  The line printer will never shutdown with an  error
         and  the  job will never complete.  The job should be aborted
         and the printer shutdown before  attempting  to  restart  the
         station.

      o  If a RJE session has been completed and the  TOPS20  operator
         shuts  the IBM RJE node down (OPR SHUTDOWN NODE), the line is
         not disabled.  This means that any node running on  a  dialup
         line  will  not  hang  up.  Anyone running RJE communications
         over long-distance lines not wanting to  pay  for  superflous
         telephone  connect time should have an operator manually hang
         up the phone.




4.2  Emulation


      o  The job running IBMSPL must be connected to a PS:  directory.
         It  does make any difference what directory, as long as it is
         on PS:.  If IBMSPL is not connected to PS:,  any  files  that
         are  read  from  a  IBM host to be printed on the lineprinter
         will not be queued.

      o  If the IBM host is connected to  the  DN64  front  end  by  a
         hardwired  line,  a  session should be completed by sending a
         signoff message in a batch  submission  before  shutting  the
         node  down.   If  this  is not done it may not be possible to
         change protocols (between any two of HASP,  2780,  and  3780)
         and restart a node on that particular line.
BEWARE FILE FOR DN64 WITH TOPS20 RELEASE 4.0                    Page 7
WARNINGS OF KNOWN DEFICIENCIES


4.3  General


      o  It is possible to create two nodes (DEFINE  NODE  command  to
         OPR)  that  have  the  same  port  and  line  identification.
         Unfortunately  it  is  also  possible  to  issue  START  NODE
         commands  to  both.   This will create at least one node that
         will do very strange things.  Normally one of the  two  nodes
         will generate enough fatal errors that it will shut down, but
         this is not garaunteed.  So  it  is  suggested  that  whoever
         defines  the  node  and  port/line  correlation  check it for
         consistency before allowing anyone to start a node.
BEWARE FILE FOR DN64 WITH TOPS20 RELEASE 4.0                    Page 8
DEPENDENCIES


5.0  DEPENDENCIES






The DN64 software is dependent on all of the files in the 4.0  release
package and the files indicated in the DN64 Installation Manual.

In addition, all the hardware to support TOPS-20 and  the  DN64  Front
End is required to be present and functioning.



[End of DN64.BWR]