+----------------+  
|                |
| Memory Buffer  |   Higher Memory Addresses
|                |
+----------------+             ^           
|                |             |
| Save Buffer    |             |
|                |             |
+----------------+             |
|                |             |
| Free Memory    |             |
|                |             |
+----------------+             |
|                |             |
| Command Input  |             |
|    Buffer      |             |
+----------------+             v
|                |  
| Text Buffer    |   Lower Memory Addresses
|                |  
+----------------+