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 | ||||||
BFD000-BFDF00 | 3840 bytes | 8520-B (access at even-byte addresses only) | ||||||
BFE001-BFEF01 | 3840 bytes | 8520-A (access at odd-byte addresses only) | ||||||
C00000-C7FFFF | 512KB | Reserved | Pseudo-fast RAM | Reserved | ||||
C80000-D7FFFF | 1MB | Reserved | ||||||
D80000-DBFFFF | 256KB | Reserved | ||||||
DC0000-DCFFFF | 64KB | Real time clock | ||||||
DD0000-DEFFFF | 128KB | Reserved | SCSI controller | |||||
DF0000-DFFFFF | 64KB | Custom chip registers | ||||||
E00000-E7FFFF | 512KB | Reserved | First 512KB of 1MB system ROM (not normally used) | 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 | Lower 256KB of System ROM | |||||
FC0000-FFFFFF | 256KB | System ROM | Upper 256KB of System ROM | |||||
32-bit Addresses | ||||||||
01000000 - 03FFFFFF | 48MB | N/A | Reserved | |||||
04000000-07FFFFFF | 64MB | Motherboard RAM | ||||||
08000000-0FFFFFFF | 128MB | CPU slot expansion | ||||||
10000000-7FFFFFFF | 1792MB | Zorro-III expansion space | ||||||
80000000-FEFFFFFF | 2032MB | Reserved | ||||||
FF000000-FFFFFFFF | 16MB | Zorro-III config space |
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)