Acorn Atom - Memory Map

Memory Map

The following is the memory map for the Atom. Shaded areas indicate those present on the minimal system.

Hex Address Contents Annotations
0000 Block Zero RAM 1KB RAM
0400 Teletext VDG RAM
0800 VDG CRT Controller
0900
0A00 Optional FDC
0A80
1000 Peripherals space
2000 Catalogue buffer
2200 Sequential File buffers
2800 Floating point variables Internal RAM
5KB max.
2900 Extension Text space RAM
3C00 Off-board Extension RAM
8000 8000-01FF for mode 0 (512 bytes text) Video and
BASIC RAM
6KB max.
8000 8000-83FF for mode 1 (1 KB graphics)
8000 8000-85FF for mode 2 (1.5 KB graphics)
8000 8000-8BFF for mode 3 (3 KB graphics)
8000 8000-97FF for mode 4 (6 KB graphics)
9800
A000 Optional Utility ROM
B000 PPIA I/O Device
B800 Optional VIA I/O Device for Printer Interface
C000 ATOM BASIC Interpreter 4KB ROM
D000 Optional Extension ROM
E000 Optional Disk Operating System
F000 Assembler 4 KB ROM
Cassette Operating System

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