its_starting_and_stopping []

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**Starting and stopping ITS**

Except on KL10, starting ITS goes like this:
  - Start DSKDMP.
    * On a KA10 this is most often done from paper tape, but magnetic tape is also possible.
    * On a KS10, use the ''BT'' console command to boot into DSKDMP.
  - DSKDMP will announce itself eponymously.
  - Select an ITS core image.  Conventionally it should be @ ITS.  Type //F Altmode// to see a file listing.
  - To load and run ITS, type the file name and enter.  If the first file name is @ that can be omitted.
  - First DDT is entered.  Here's a chance to debug ITS, set breakpoints, etc.
  - To start ITS running, type //Altmode G//.
  - The Salvager will check the disks and then ITS IN OPERATION is printed.

On the KL10, there is no DSKDMP.  DDT is used to load a core image and start.

Stopping ITS goes like this:
  - Log in and run LOCK.
  - Type //5DOWN// to have ITS shut down in 5 minutes.  This is the minimum.
  - Type //Y// to confirm.
  - Type a message terminated by a //^C//.
  - Type //Q// to exit LOCK.
  - When all users are logged out, ITS will shut down immediately regardless of the grace period.
  - When "YOU ARE NOW IN DDT" is printed, it's safe to power off.
  - Optionally you can restart ITS from DDT, or go back to DSKDMP by jumping to address 777700.

A transcript of starting ITS, logging in, and stopping.  It has been edited for brevity.

'' DSKDMP''\\ 
//its//\\ 
//$G//\\ 
''SALVAGER.317''\\ 
''ITS 1649 IN OPERATION''\\ 
''ITS 1649 SYSTEM JOB USING THIS CONSOLE.''\\ 
//^Z//\\ 
''ITS.1649. DDT.1547.''\\ 
''TTY 0''\\ 
''You're all alone, Fair share = 99%''\\ 
//:lock//\\ 
'' LOCK.156''\\ 
''_''//5down//\\ 
''DO YOU REALLY WANT THE SYSTEM TO GO DOWN?''\\ 
//Y//\\ 
''PLEASE ENTER A BRIEF MESSAGE TO USERS, ENDED BY ^C''\\ 
//Bye.//\\ 
//^C//\\ 
''ITS 1649 NOT IN OPERATION''\\ 
''SHUTDOWN COMPLETE''\\ 
''PI LEVEL 7 BUGDDT.  TYPE <ALTMODE>P TO CONTINUE.''\\ 
''YOU ARE NOW IN DDT.''
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