+---------------------------+                    +-----------------+         
|                           |                    |                 |
|                           |                    |                 | <----+        
|            CPU            |                    |   System (SY:)  |      |        
| (Central Processing Unit) |                    |                 |  The same     
|                           |                    |                 |  when you     
|                           |                    +-----------------+  start RT-11, 
+---------------------------+                    |                 |  but can      
|                           |                    |     Default     |  then differ  
|                           |         +--------> |     Data (DK:)  |      |          
|           Memory          |         |          |                 | <----+        
|                           |         |          |                 |
|                           |   Can be the same  +-----------------+           
|                           |         |          |                 |           
+---------------------------+         |          |                 |
                                      +--------> |     Backup      |
                                                 |                 |           
                                                 |                 |           
                                                 +-----------------+