BBC Micro Memory Map
BBC Micro Memory Map
The following table shows the memory map for the BBC Micro & BBC Master microcomputers.
| Docs | Address | All machines | BBC Master 128 | |
|---|---|---|---|---|
| Page 00 | 0000 | Current Language Zero Page | Master maps main ram even in shadow mode | |
| 0090 | Operating System Zero Page | |||
| 0100 | Processor Stack | |||
| Page 02 | 0200 | Operating System Workspace | ||
| Page 03 | 0300 | |||
| 0400 | Current Language Workspace | |||
| 0500 | ||||
| 0600 | ||||
| 0700 | ||||
| Page 08-0D | 0800 | Sound & Printer Buffer | ||
| 0900 | RS423, Speech & Tape output Buffer | |||
| 0A00 | RS423 & Tape input Buffer | |||
| 0B00 | Function Keys | |||
| 0C00 | User defined graphics | |||
| 0D00 | NMI routines (Disk/Econet) | |||
| 0D9F | Expander vector set | |||
| 0DF0 | Paged ROM workspace storage locations | |||
| Page 0E-18 | 0E00 | USER workspace | DFS workspace (not Master) | |
| 1900 | ||||
| 3000 | Screen (Mode 0, 1, 2) |
USER workspace with shadow Mode 128…134 Screen memory is in shadow ram at same addresses as on normal machines |
||
| 4000 | Screen (Mode 3) | |||
| 5800 | Screen (Mode 4, 5) | |||
| 6000 | Screen (Mode 6) | |||
| 7B00 | Screen (Mode 7) | |||
| Paged Rom | 8000 | Paged Roms | Private Ram | |
| C000 | OS ROM | Paged rom workspace | ||
| DC00 | MOS CLI Buffer | |||
| DD00 | *MOVE workspace | |||
| DF00 | MOS private workspace | |||
| E000 | OS ROM | |||
| FC00 | FRED 1MHz bus | |||
| FD00 | JIM 1MHz bus | |||
| FE00 | SHIELA I/O Memory | |||
| FF00 | OS ROM Vectors | |||
Last modified November 2, 2021: Change page titles so category list is meaningful (41ff6fd)