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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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aga_a1200_a4000 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections 2026-04-23 12:17:35 -04:00
common docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections 2026-04-23 12:17:35 -04:00
ecs_a600_a3000 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections 2026-04-23 12:17:35 -04:00
ocs_a500 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections 2026-04-23 12:17:35 -04:00
README.md docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections 2026-04-23 12:17:35 -04:00

README.md

← Home

Hardware — Chipset Generation Overview

Generation Comparison

Feature OCS ECS AGA
Agnus 8361/8367 8372A (Super Agnus) Alice (8374)
Denise 8362 8373 (ECS Denise) Lisa
Paula 8364 8364 (unchanged) 8364 (unchanged)
Max Chip RAM 512 KB–1 MB 1–2 MB 2 MB
Colours (max normal) 32 32 256
HAM 12-bit HAM (6bpp) 12-bit HAM 24-bit HAM8 (8bpp)
Sprites 8 × 16px 8 × 16px 8 × 64px, 256 colours
Blitter bus 16-bit 16-bit 64-bit (FMODE)
Display modes NTSC/PAL +Productivity, VGA +Doublescan, 31kHz
Machines A500/A1000/A2000 A600/A3000/A500+ A1200/A4000/CD32

Custom Register Address Space

All chipset generations share the base address $00DFF000 for custom registers. Registers are memory-mapped, mostly 16-bit wide.

$DFF000  BLTDDAT   Blitter destination early read
$DFF002  DMACONR   DMA control (read)
$DFF004  VPOSR     Vertical position (read, high)
...
$DFF180  COLOR00   Colour register 0
...
$DFF1FE  (last OCS/ECS register)
$DFF1FC  BEAMCON0  (ECS+) beam control
$DFF1FC+ (AGA extensions)

See custom_registers_full.md for the complete table across all chipsets.

Navigation

Subfolder Content
common/ M68k CPU, address space layout, CIA chips, Zorro bus
ocs_a500/ OCS chipset — A500, A1000, A2000
ecs_a600_a3000/ ECS chipset — A600, A3000, A500+
aga_a1200_a4000/ AGA chipset — A1200, A4000, CD32

References