Difference between revisions of "Amiga memory map"

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(→‎Memory map)
(→‎Memory map)
Line 63: Line 63:
 
| colspan="7" | Reserved
 
| colspan="7" | Reserved
 
|-
 
|-
−
| BFD000-BFDF00
+
| BF0000-BFFFFF
−
| 3840 bytes
+
| 64KB
−
| colspan="7" | 8520-B (access at even-byte addresses only)
+
| colspan="7" | 8520 CIAs and timers
 
|-
 
|-
−
| BFE001-BFEF01
+
| C00000-C7FFFF
−
| 3840 bytes
+
| 512KB
−
| colspan="7" | 8520-A (access at odd-byte addresses only)
+
| rowspan="3" | Reserved
 +
| colspan="2" | Pseudo-fast RAM
 +
| colspan="3" rowspan="2" | Reserved
 +
| rowspan="2" | Chip register shadow
 
|-
 
|-
−
| C00000-C7FFFF
+
| C80000-CFFFFF
 +
| 512KB
 +
| colspan="2" rowspan="2" | Reserved for pseudo-fast RAM
 +
|-
 +
| D00000-D7FFFF
 
| 512KB
 
| 512KB
−
| Reserved
+
| colspan="4" | Reserved
−
| Pseudo-fast RAM
 
−
| colspan="5" | Reserved
 
 
|-
 
|-
−
| C80000-D7FFFF
+
| D80000-D9FFFF
−
| 1MB
+
| 128KB
 
| colspan="7" | Reserved
 
| colspan="7" | Reserved
 
|-
 
|-
−
| D80000-DBFFFF
+
| DA0000-DBFFFF
−
| 256KB
+
| 128KB
−
| colspan="7" | Reserved
+
| colspan="3" | Reserved
 +
| colspan="2" | IDE controller
 +
| colspan="2" | Reserved
 
|-
 
|-
 
| DC0000-DCFFFF
 
| DC0000-DCFFFF
Line 91: Line 98:
 
| DD0000-DD0FFF
 
| DD0000-DD0FFF
 
| 4KB
 
| 4KB
−
| colspan="5" | Reserved
+
| colspan="5" rowspan="3" | Reserved
−
| rowspan="2" | SCSI controller
+
| rowspan="3" | SCSI controller
 
| SCSI controller
 
| SCSI controller
 
|-
 
|-
 
| DD1000-DD3FFF
 
| DD1000-DD3FFF
 
| 12KB
 
| 12KB
−
| colspan="5" | Reserved
 
 
| IDE controller
 
| IDE controller
 
|-
 
|-
−
| DD4000-DEFFFF
+
| DD4000-DDFFFF
−
| 112KB
+
| 48KB
−
| colspan="5" | Reserved
 
 
| Reserved
 
| Reserved
 +
|-
 +
| DE0000-DEFFFF
 +
| 64KB
 +
| colspan="7" | Custom chip registers and mainboard resources
 
|-
 
|-
 
| DF0000-DFFFFF
 
| DF0000-DFFFFF
Line 112: Line 121:
 
| 512KB
 
| 512KB
 
| colspan="3" | Reserved
 
| colspan="3" | Reserved
−
| colspan="2" | First 512KB of 1MB system ROM (not normally used)
+
| colspan="2" | Reserved for first 512KB of 1MB system ROM
 
| colspan="2" | Reserved
 
| colspan="2" | Reserved
 
|-
 
|-
Line 134: Line 143:
 
| 256KB
 
| 256KB
 
| colspan="2" | Reserved
 
| colspan="2" | Reserved
−
| colspan="5" | Lower 256KB of System ROM
+
| colspan="5" rowspan="2" | System ROM
 
|-
 
|-
 
| FC0000-FFFFFF
 
| FC0000-FFFFFF
 
| 256KB
 
| 256KB
 
| colspan="2" | System ROM
 
| colspan="2" | System ROM
−
| colspan="5" | Upper 256KB of System ROM
 
 
|-
 
|-
 
! colspan="9" | 32-bit Addresses
 
! colspan="9" | 32-bit Addresses
Line 145: Line 153:
 
| 01000000 - 03FFFFFF
 
| 01000000 - 03FFFFFF
 
| 48MB
 
| 48MB
−
| colspan="5" rowspan="6"| N/A
+
| colspan="5" rowspan="8"| N/A
 
| colspan="2" | Reserved
 
| colspan="2" | Reserved
 
|-
 
|-
 
| 04000000-06FFFFFF
 
| 04000000-06FFFFFF
 
| 48MB
 
| 48MB
−
| colspan="2" | Reserved
+
| colspan="2" | Reserved for motherboard RAM expansion
 
|-
 
|-
 
| 07000000-07FFFFFF
 
| 07000000-07FFFFFF
Line 168: Line 176:
 
| colspan="2" | Reserved
 
| colspan="2" | Reserved
 
|-
 
|-
−
| FF000000-FFFFFFFF
+
| FF000000-FF00FFFF
−
| 16MB
+
| 64KB
 
| colspan="2" | Zorro-III config space
 
| colspan="2" | Zorro-III config space
 +
|-
 +
| FF010000-FFFFFFFF
 +
| 16320KB
 +
| colspan="2" | Reserved
 
|}
 
|}
  

Revision as of 18:02, 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
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)
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