Acorn Communicator Memory Map
                       =============================

       Bank                              Contents
+--------+----------+---------------------------------+--------------------+
| &00    | &00      | &00-&07     512K System RAM     |         1M         |
|        |          +---------------------------------+       System       |
|        |          | &08-&0F Copy of 512K System RAM |         RAM        |
|        | Internal +---------------------------------+--------------------+
|        |   RAM    | &10-&17                         |     Copy of 1M     |
|        |          +---------------------------------+       System       |
|        | &1F      | &18-&1F                         |         RAM        |
| RAM    +----------+---------------------------------+--------------------+
|        | &20                                                             |
|        |                                                                 |
|        |                                                                 |
|        | External                                                        |
|        |   RAM                                                           |
|        |                                                                 |
| &3F    | &3F                                                             |
+--------+-----------------------------------------------------------------+
| &40    | &40   MODEM                                                     |
|        | &41   Econet ID                                                 |
|        | &42   6522 VIA (printer, etc.)                                  |
|        | &43   2641 ACIA (serial)                                        |
|        | &44   CHOOSWITCH                                                |
|        | &45   Video memory and Video ULA                                |
|        | &46   CMOS RAM                                                  |
|Internal| &47   68B54 (Econet)                                            |
|  I/O   +-----------------------------------------------------------------+
|        | &48                                                             |
|        |                                                                 |
|        |       Reserved                                                  |
|        |                                                                 |
|        |                                                                 |
| &7F    | &7F                                                             |
+--------+-----------------------------------------------------------------+
| &80                                                                      |
|          &B0 ZIF socket 0                                                |
|          &B1 ZIF socket 0                                                |
|          &B2 ZIF socket 1                                                |
|External  &B3 ZIF socket 1                                                |
|  I/O     &B4 ZIF socket 2                                                |
|          &B5 ZIF socket 2                                                |
|          &B6 ZIF socket 3                                                |
|          &B7 ZIF socket 3                                                |
|          &BA battery-backed RAM                                          |
| &BF                                                                      |
+--------+-----------------------------------------------------------------+
| &C0    | &C0                                                             |
|        |  External                                                       |
|        | expansion                                                       |
|        |    ROMs                                                         |
|        | &F7                                                             |
|        +----------+------------------------------------------------------+
|        | &F8      | &F8 Empty            ROM slot 3                      |
| ROMs   |          | &F9 Empty            ROM slot 3                      |
|        |          | &FA ROM bank 4       ROM slot 2                      |
|        | Internal | &FB ROM bank 4       ROM slot 2                      |
|        |   ROMs   | &FC ROM bank 3       ROM slot 1                      |
|        |          | &FD ROM bank 2       ROM slot 1                      |
|        |          | &FE ROM bank 0       ROM slot 0                      |
| &FF    | &FF      | &FF ROM bank 1       ROM slot 0                      |
+--------+----------+------------------------------------------------------+