.OP
.MT3
.MB2
                   Figure 1.  Expanded memory mapping diagram 

 ----------           ---- EXECUTE PROTECT
| LOCK AND |         |     (INSTRUCTION ACCESS)
|KEY ACCESS|         |
| PROTECT  |         |                                    ---------------------------------------------
 ----------          |                                   |         PPA         |                       |     23-BIT
 /|\    /|\          |---- WRITE PROTECT                  ---------------------------------------------  PHYSICAL ADDRESS
  |      |           |     (OPERAND ACCESS)               \                   / \                     /
  |      |           |                                     -------------------   --------------------- 
  |      |           |                                             /|\                    /|\
  |      |           |                                              |                      |
  |      |  4        |                             11               |                      |
  |       --/---     |            -----------------/----------------                       |
  / 4           |    |           |                                                         |
  |             |    |           |                                                         |
  |           -----  |  -------------------                                                |
  |          /     \ | /                   \                                               |
  |          -------------------------------                                               |
  |         |       | |                     |                                              |
  |         |  -------------------------------                                             |
  |         |-|  AL   |E|         PPA         |                                            |
  |         | |       |W|                     |                                            |
  |         | |-------------------------------|                                            |
  |         | |                               |                                            |
  |         | |                               |                                            |
  |         | |                               |                                            |
  |         | |                               |                                            |
  |         | |                               |                                            |
  |         | |                               |                                            |
  |         | |          -------------------------------                                   |
  |         | |         |       | |                     |                                  |
  |         .-|         |  -------------------------------                                 |
  |          .|         |-|  AL   |E|         PPA         |                                |
  |       /   .---------| |       |W|                     |                                |
  |       \    .        | |-------------------------------|                                |
  |        \    .       | |                               |                                |
  |         \    .      | |                               |                                |
  |          \    .     | |                               |                                |
  |           \    .    | |       -------------------------------                          |
  |            \    .   | |      |       | |                     |                         |
  |             \    .  | |      |  -------------------------------                        |
  |              \    . | |      |-|  AL   |E|         PPA         |  \                    |
  |               \    .| |      | |       |W|                     |   |                   |
  |                \    .-|      | |-------------------------------|   |                   |
  |                 \    .|      | |                               |   |                   |
  |                  \    .------| |                               |   |                   |
  |                   \    .     | |                               |   |                   |
  |                    \    .    | |                               |   |<--                |
  |                 --> \    .   | |                               |   |   |               |


                              continued on the next page








                                 Figure 1.  Expanded memory mapping diagram - continued



  |         | |          -------------------------------                                   |
  |         | |         |       | |                     |                                  |
  |         .-|         |  -------------------------------                                 |
  |          .|         |-|  AL   |E|         PPA         |                                |
  |       /   .---------| |       |W|                     |                                |
  |       \    .        | |-------------------------------|                                |
  |        \    .       | |                               |                                |
  |         \    .      | |                               |                                |
  |          \    .     | |                               |                                |
  |           \    .    | |       -------------------------------                          |
  |            \    .   | |      |       | |                     |                         |
  |             \    .  | |      |  -------------------------------                        |
  |              \    . | |      |-|  AL   |E|         PPA         |  \                    |
  |               \    .| |      | |       |W|                     |   |                   |
  |                \    .-|      | |-------------------------------|   |                   |
  |                 \    .|      | |                               |   |                   |
  |                  \    .------| |                               |   |                   |
  |                   \    .     | |                               |   |                   |
  |                    \    .    | |                               |   |<--                |
  |                 --> \    .   | |                               |   |   |               |
  |                |     \    .  | |                               |   |   |               |
  |                |      \    . | |                               |   |   |               |
  |                |       \    .| |-------------------------------|   |   |               |
  |                / 9      \    .-|  AL   |E|         PPA         |   |   |               |
  |                |         \    .|       |W|                     |  /    |               |
  |                |          \    .-------------------------------        |               |
  |                |           \                                           |               |
   ----------      |            \/                                         |               |
             |     |                                                       / 4             / 12
        ---------->|<--------------                                        |               |
       |     |     |               |                                       |               |
       / 4   |     / 4             / 1                                     |               |
       |     |     |               |                                       |               |
      ---   ---   ---              |                                     ----- - ---------------------
     /   \ /   \ /   \                                                  /     \ /                     \
     -----------------           INSTRUCTION/OPERAND                    -------------------------------
    |  PB |  PS | AS  |          ACCESS DESIGNATOR                     |  LPA  |                       |    16-BIT
     -----------------           FROM HARDWARE                          -------------------------------  LOGICAL ADDRESS
                                                                        \     / \                     /
   PROCESSOR STATUS WORD FIELDS                                          -----   ---------------------
                                                                           |               |
                                                                           |               |
                                                                           |                --------- ADDRESS OF WORD
                                                                           |                          WITHIN 4K PAGE
                                                                           |  
                                                                            ------- LOGICAL ADDRESS OF 4K PAGE