Amiga memory map
Standard amount of memory in the Amiga
- Amiga 1000 - 256KB chip RAM
- Amiga 500 - 512KB chip RAM
- Amiga 500+ - 1MB chip RAM
- Amiga 2000 - 512KB chip RAM, later 1MB chip RAM
- Amiga 3000 - 1-2MB chip RAM, 1MB fast RAM
- Amiga 600 - 1MB chip RAM
- Amiga 1200 - 2MB chip RAM
- Amiga 4000 - 2MB chip RAM, 2-4MB fast RAM
Memory map
| Address Range | Size | Function | ||||||
|---|---|---|---|---|---|---|---|---|
| A1000 | A500 / 2000 | A500+ | A600 | A1200 | A3000 | A4000 | ||
| 000000-03FFFF | 256KB | First 256KB of chip RAM | ||||||
| 040000-07FFFF | 256KB | 256KB chip RAM expansion card | Second 256KB of chip RAM (to 512KB) | |||||
| 080000-0FFFFF | 512KB | Reserved | Second 512KB of chip RAM (to 1MB) | |||||
| 100000-1FFFFF | 1MB | Reserved | Second 1MB of chip RAM (to 2MB) | |||||
| 200000-5FFFFF | 4MB | First 4 MB Auto-config space / Fast RAM | ||||||
| 600000-9FFFFF | 4MB | Second 4 MB Auto-config space / Fast RAM | PCMCIA memory card / Fast RAM | Second 4 MB Auto-config space / Fast RAM | ||||
| A00000-A7FFFF | 512KB | Reserved | PCMCIA control registers | Reserved | ||||
| A80000-BEFFFF | 1471KB | Reserved | ||||||
| BF0000-BFFFFF | 64KB | 8520 CIAs and timers | ||||||
| C00000-C7FFFF | 512KB | Reserved | Pseudo-fast RAM | Reserved | Chip register shadow | |||
| C80000-CFFFFF | 512KB | Reserved for pseudo-fast RAM | ||||||
| D00000-D7FFFF | 512KB | Reserved | ||||||
| D80000-D9FFFF | 128KB | Reserved | ||||||
| DA0000-DBFFFF | 128KB | Reserved | IDE controller | Reserved | ||||
| DC0000-DCFFFF | 64KB | Real time clock / Clock port | ||||||
| DD0000-DD0FFF | 4KB | Reserved | SCSI controller | SCSI controller | ||||
| DD1000-DD3FFF | 12KB | IDE controller | ||||||
| DD4000-DDFFFF | 48KB | Reserved | ||||||
| DE0000-DEFFFF | 64KB | Custom chip registers and mainboard resources | ||||||
| DF0000-DFFFFF | 64KB | Custom chip registers | ||||||
| E00000-E7FFFF | 512KB | Reserved | Reserved for first 512KB of 1MB system ROM | Reserved | ||||
| E80000-E8FFFF | 64KB | Auto-config space. Boards appear here before the system relocates them to their final address. | ||||||
| E90000-EFFFFF | 448KB | Secondary auto-config space (usually 64K I/O boards) | ||||||
| F00000-F7FFFF | 512KB | Reserved | Extended ROM (CDTV) | Reserved | Flash ROM / Extended ROM (CD32) | Diagnostic ROM | ||
| F80000-FBFFFF | 256KB | Reserved | System ROM | |||||
| FC0000-FFFFFF | 256KB | System ROM | ||||||
| 32-bit Addresses | ||||||||
| 01000000 - 03FFFFFF | 48MB | N/A | Reserved | |||||
| 04000000-06FFFFFF | 48MB | Reserved for motherboard RAM expansion | ||||||
| 07000000-07FFFFFF | 16MB | Motherboard RAM | ||||||
| 08000000-0FFFFFFF | 128MB | CPU slot expansion | ||||||
| 10000000-7FFFFFFF | 1792MB | Zorro-III expansion space | ||||||
| 80000000-FEFFFFFF | 2032MB | Reserved | ||||||
| FF000000-FF00FFFF | 64KB | Zorro-III config space | ||||||
| FF010000-FFFFFFFF | 16320KB | Reserved | ||||||
Note that various modifications and third party hardware can change the details of this map.
Some special addresses: * 000000-000100 - MC680x0 Exception Vector Assignment table (if VBR=0) * 000004 - Exec base (pointer to exec.library jumptable)
Sources for this info
- Amiga Hardware Reference Manual (1986)
- M68000 Programmer's Reference Manual (1984,fourth edition)
- amiga-hardware.com (for standard amount of memory)
