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Bus and memory updates

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Ilia Sharin 2026-04-30 11:15:34 -04:00
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01_hardware/common/address_space.md
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## Overview
The Amiga uses a **24-bit physical address bus** on OCS/ECS machines (68000/68020 effective), giving 16 MB of addressable space. AGA machines with 68030/040 and 32-bit-clean software can address the full 4 GB, but Chip RAM and custom registers remain in the lower 16 MB.
The Amiga uses a **24-bit physical address bus** on OCS/ECS machines (68000/68020 effective), giving 16 MB of addressable space.
AGA machines with 68030/040/060 and 32-bit-clean software can address the full 4 GB, but Chip RAM and custom registers remain in the lower 16 MB.
## Memory Map — 24-bit (OCS/ECS: A1000, A500, A500+, A2000, A600, A3000, CDTV)
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- Commodore A1200/A4000 Technical Reference Manuals (local archive)
- See also: [memory_types.md](memory_types.md) — Chip RAM vs Fast RAM vs Slow RAM, DMA accessibility, per-model configurations
- See also: [chip_ram_expansion.md](../ecs_a600_a3000/chip_ram_expansion.md) — 2 MB Chip RAM with Super Agnus
- See also: [bus_architecture.md](bus_architecture.md) — Bus mechanics, register access patterns, cross-domain transfers