Difference between revisions of "Amiga memory map"

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(Memory map)
(Memory map)
Line 65: Line 65:
| 4096 bytes
| 4KB
| Custom chip registers
| Custom chip registers

Revision as of 11:31, 15 September 2016

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
000000-03FFFF 256KB 256K bytes of chip RAM
040000-07FFFF 256KB 256K bytes of chip RAM (Amiga 1000 option card)
080000-0FFFFF 512KB 512K bytes of extended chip RAM (to 1 MB)
100000-1FFFFF 1024KB 1024K bytes of extended chip RAM (to 2 MB) (on models with ECS or AGA chipsets)
200000-9FFFFF 8MB Primary 8 MB Auto-config space (Fast RAM)
A00000-BEFFFF 1984KB 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-D7FFFF 1536KB Internal expansion memory (pseudo-fast, Slow RAM on Amiga 500)
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 / diagnostic ROM
F80000-FBFFFF 256KB Reserved (1.x), lower half of System ROM (2.x, 3.x)
FC0000-FFFFFF 256KB 256K System ROM (1.x), upper half of System ROM (2.x, 3.x)
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)