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 | 512KB chip RAM expansion card (A500 trapdoor) | Second 512KB of chip RAM (to 1MB) | ||||
100000-1FFFFF | 1MB | Reserved | 1MB chip RAM expansion card | 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)