Difference between revisions of "Geneve logical memory map"
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| Line 105: | Line 105: | ||
! 8600 | ! 8600 | ||
| External bus | | External bus | ||
| class="descr" | Any device in the PEB that maps to bank bc | |||
|- | |- | ||
! 8800 | ! 8800 | ||
Revision as of 15:32, 26 January 2021
The logical address map determines which devices or memory areas appear in the logical address space. These are the addresses as seen from the CPU or the program that is run, but they need not correspond to the same physical address at all times. The correspondence is provided by the mapper.
Native mode
| 0000 | Reserved | Operating system |
|---|---|---|
| 0400 | Free space | Onboard memory or expansion |
| 2000 | ||
| 4000 | ||
| 6000 | ||
| 8000 | ||
| A000 | ||
| C000 | ||
| E000 | ||
| F000 | On-chip memory | Hides mapped page |
| F100 | Video ports | |
| F108 | Keyboard | |
| F110 | Mapper | |
| F120 | Sound chip | |
| F130 | Clock chip | |
| F140 | Free space | Onboard memory or expansion |
| F800 | ||
| FFF8 | ||
| FFFA | Decrementer | |
| FFFC | NMI vector | |
| FFFE |
GPL mode
| 0000 | GPL interpreter | Operating system |
|---|---|---|
| 2000 | Free space 8 KiB | Onboard memory or expansion |
| 3000 | ||
| 3FFE | ||
| 4000 | DSR space | Normally used by the GeneveOS DSR |
| 6000 | Cartridge ROM contents | Loaded from disk |
| 8000 | Mapper registers | |
| 8008 | Keyboard | |
| 8010 | Clock chip | |
| 8020 | Free space | |
| 8400 | Sound chip | |
| 8600 | External bus | Any device in the PEB that maps to bank bc |
| 8800 | Video ports | |
| 9000 | Speech synthesizer | if plugged into the PEB |
| 9800 | GRAM | |
| A000 | Free space 24 KiB | |
| C000 | ||
| E000 | ||
| F000 | On-chip memory | Hides mapped page |
| F100 | Free space | |
| FFFA | Decrementer | |
| FFFC | NMI vector | |
| FFFE |