Before you can stop Desktop CYBER you have to cleanly shut down first CYBIS and then the NOS operating system. If the system is not cleanly shut down as described below, NOS disks and CYBIS master files may be left in an inconsistent state and subsequent runs may fail.

The CYBIS shutdown procedure is documented in the operations manual. If not performed correctly the file system is so simple that it is not likely to be affected. What may be affected are lessons that use “common” - shared ECS for data or communication - which is checkpointed back to disk at times such as on shutdown.

To shut down CYBIS first you have to sign in as one of the administrators under Group “s” so that you are at the “System Mode” screen:

Now press “1” to bring up the System Options screen:

Select “3 Backout options” and the screen changes to:

Press SHIFT-HELP for immediate full system backout. After one or two seconds the screen changes back to System Options. Press SHIFT-STOP twice to exit and log off. On the console screen the display shows “Full System Backout Completed”:

Enter “K,MAS1.” to bring op the K-Display for Mastor and then enter “K.STOP” to shutdown CYBIS:

After a few seconds all CYBIS subsystem control points have terminated and the console display shows:

Now enter left-blank (i.e. “[”) and “AB.” to get rid of the stale K display and then shut down NAM with the command “IDLE,NAM.”. After a few seconds of activity NAM has shut down and the NAM Dayfile has printed on the BIO control point. The console screen shows:

Now enter “UNLOCK.” followed by “CHECK POINT SYSTEM.” (the command auto-completes after a few characters):

After a few seconds the checkpoint has completed:

The final console command is “STEP.” to stop all PP activity and any further disk accesses.

THIS IS IMPORTANT – DON’T FORGET IT.

The NOS operating system is now fully shut down. To terminate the emulation go to the operator window and type “shutdown” and then press the Enter key:

The operator window closes a few seconds after “shutdown” has been entered. All buffers are flushed to disk and CM and PPU memories and tape controller conversion tables are saved.