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! d i g i t a l !   I N T E R O F F I C E  M E M O R A N D U M
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                                       Date: 19-February-82
                                       From: TSG/NCSS
                                       Loc:  MR1-2/H22
                                       Ext:  HOTLINE  5911


Subj:   DDT11 Command Files

Included on the tape are six files  which  will  help  you  look  at
RSX20F  dumps.  Used in conjunction with DDT11 these files will help
you examine some common points of interest in your dumps.

DDT11 has a facility invoked by the $Y command which  allows  it  to
execute  a  file  of DDT11 commands as if you had typed the commands
yourself.  The information extracted may be saved in a disk file  or
appear on your terminal.


The files we have included which may be used in this way are:

     1.  ATL.DDT - A command file to show the active task list.

     2.  DUMPFE.DDT - A command file to show RSX20F version  number,
         crash  code,  date of crash, saved stack pointer, and other
         information which identifys the dump.

     3.  TO11Q.DDT - A command file to  show  the  contents  of  the
         TO11Q.

     4.  TTTBL.DDT - A command file to  show  the  contents  to  the
         terminal line blocks.

     5.  ST1445.DDT - A command file of symbols which are needed  to
         use the command file IOPAGE.DDT.

     6.  IOPAGE.DDT - A command file that will show the contents  of
         the IO page saved by RSX20F during a crash.



If you wanted to use the command file DUMPFE.DDT to look at  a  dump
and  save  the  output in a file called JAN7.DMP you would enter the
following dialogue with a running DDT11.

$Y                      ;escape Y to show that you want to use a
                        ;command file



Log responses where: JAN7.LOG   ;tell DDT11 to put the output in a
                                ;disk file to see the output on the

                                                              Page 2
Subj:	DDT11 Command Files


                                ;terminal type TTY:<cr>

FILE:   DUMPFE                  ;tell DDT11 which command file to use

File DSK:JAN7.DMP 16:20 7-Jan-82 written        ;the file is written 



The command file ST1445.DDT contains additional  symbol  definations
which  make  the output from IOPAGE.DDT readable.  To use IOPAGE you
first must cause DDT11 to "take" the file  ST1445.   You  must  SAVE
this  new copy of DDT11.  Next RUN your new copy of DDT11 and "take"
the file IOPAGE.DDT and proceed as above.

The dialogue to accomplish this would look like this:


RUN DDT11

DDT11 6(67)

Input: VB1445.MAP/FESYMB        ;load RSX20F's symbols

Input:/GO                       ;start DDT11 so we can execute
                                ;command files.

$Y                              ;we wish to use a command file

Log responses where:    TTY:    ;say tty for conservations sake

FILE:   ST1445.DDT              ;take this file

DDT11 and the file will now output information to your screen.
When they finish type:
 
^Z
SAVE NEWDDT     ;save DDT11 with the symbols from ST1445
RUN NEWDDT      ;run this new DDT11 and "take" the file
                ;IOPAGE as shown above.


To learn more about the meaning of the information which the command
files will extract from dumps read the RSX20F manual which is a part
of your monitor notebook set.

There are also text and comments in  the  command  files  themselves
which  will be helpful.  Read the command files for this information
even if you are not  currently  interested  in  how  the  files  are
constructed.