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amiga-bootcamp/00_overview/hardware_models.md
Ilia Sharin 21751c0025 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections 
Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.
2026-04-23 12:17:35 -04:00

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Amiga Hardware Models Reference

Model Specification Table

Model Year CPU MHz Chipset Chip RAM ROM Expansion
A1000 1985 68000 7.14 OCS 256 KB 256 KB Sidecar
A500 1987 68000 7.09 OCS 512 KB 256 KB Edge connector
A2000 1987 68000 7.14 OCS/ECS 512 KB–1 MB 256/512 KB Zorro II, ISA, CPU slot
A500+ 1991 68000 7.09 ECS 1 MB 512 KB Edge connector
A600 1992 68000 7.09 ECS 1 MB 512 KB PCMCIA, IDE, trapdoor
A3000 1990 68030 16/25 ECS 1 MB 512 KB Zorro III, ISA, SCSI
A1200 1992 68020 14.18 AGA 2 MB 512 KB PCMCIA, IDE, trapdoor
A4000 1992 68030/040 25 AGA 2 MB 512 KB Zorro III, IDE
A4000T 1994 68040/060 25 AGA 2 MB 512 KB Zorro III, SCSI
CD32 1993 68020 14.18 AGA 2 MB 512 KB SX-1, CD-ROM

CPU Feature Matrix

CPU Bus Address I-Cache D-Cache MMU FPU
68000 16-bit 24-bit — — — External 68881
68020 32-bit 32-bit 256 B direct — External 68851 External 68881/2
68030 32-bit 32-bit 256 B 256 B On-chip External 68882
68040 32-bit 32-bit 4 KB 4-way 4 KB 4-way On-chip On-chip (partial)
68060 32-bit 32-bit 8 KB 4-way 8 KB 4-way On-chip On-chip (partial)

Note

68040 and 68060 have on-chip FPUs that omit transcendental instructions. AmigaOS provides 68040.library and 68060.library to trap the missing opcodes via Line-F emulation.

Kickstart ROM Sizes

OS Version ROM Size Part Models
1.2 / 1.3 256 KB Single A500, A2000
2.04 512 KB Single A500+, A600, A3000
3.0 / 3.1 512 KB Single A1200, A4000
3.1 512 KB + 512 KB Ext Pair A4000 (with ext ROM)

References