Amiga memory map

From Amiga Coding
Revision as of 13:47, 15 September 2016 by Daedalus (talk | contribs) (Memory map)
Jump to: navigation, search

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 A3000 A1200 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 Second 512KB of chip RAM (to 1MB)
100000-1FFFFF 1MB 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 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 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 Pseudo-fast RAM
C80000-D7FFFF 1MB Reserved
D80000-DBFFFF 40KB Reserved
DC0000-DCFFFF 64KB Real time clock
DD0000-DFEFFF 188KB Reserved
DFF000-DFFFFF 4KB Custom chip registers
E00000-E7FFFF 512KB 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 Diagnostic ROM Flash ROM / Extended ROM (CD32)
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
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)
  • (for standard amount of memory)