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01_hardware/aga_a1200_a4000/README.md
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## Overview
The **Advanced Graphics Architecture** (AGA) is the final custom chipset developed by Commodore, shipping from 1992. It dramatically expands colour depth, palette size, sprite capabilities, and blitter bandwidth while retaining full OCS/ECS backward compatibility.
The **Advanced Graphics Architecture** (AGA) is the final custom chipset developed by Commodore, shipping from 1992. It dramatically expands color depth, palette size, sprite capabilities, and blitter bandwidth while retaining full OCS/ECS backward compatibility.
## Chip Summary
| Chip | Name | Changes from ECS |
|---|---|---|
| **Alice** | MOS 8374 | Super Agnus successor: 64-bit bus, FMODE register |
| **Lisa** | (unnamed MOS) | ECS Denise successor: 8-bit palette, 256 colours |
| **Lisa** | (unnamed MOS) | ECS Denise successor: 8-bit palette, 256 colors |
| **Paula** | MOS 8364 | Unchanged from OCS/ECS |
## Contents
@ -20,8 +20,8 @@ The **Advanced Graphics Architecture** (AGA) is the final custom chipset develop
|---|---|
| [chipset_aga.md](chipset_aga.md) | Alice and Lisa internals, AGA architecture |
| [aga_registers_delta.md](aga_registers_delta.md) | New/changed registers vs ECS |
| [aga_palette.md](aga_palette.md) | 24-bit colour system, 256 registers |
| [aga_display_modes.md](aga_display_modes.md) | HAM8, 256-colour, doublescan, VGA |
| [aga_palette.md](aga_palette.md) | 24-bit color system, 256 registers |
| [aga_display_modes.md](aga_display_modes.md) | HAM8, 256-color, doublescan, VGA |
| [aga_blitter.md](aga_blitter.md) | 64-bit blitter bus, FMODE |
| [aga_copper.md](aga_copper.md) | AGA Copper programming guide |
| [cpu_030_040.md](cpu_030_040.md) | 68030/040 on A3000/A4000: cache, MMU, FPU |
@ -32,11 +32,11 @@ The **Advanced Graphics Architecture** (AGA) is the final custom chipset develop
| Feature | ECS | AGA |
|---|---|---|
| Colour registers | 32 (12-bit) | **256 (24-bit)** |
| Max simultaneous colours | 64 EHB / HAM | **256** (or HAM8: 262,144) |
| Color registers | 32 (12-bit) | **256 (24-bit)** |
| Max simultaneous colors | 64 EHB / HAM | **256** (or HAM8: 262,144) |
| Blitter bus | 16-bit | **64-bit** (FMODE) |
| Sprite width | 16 px | **64 px** |
| Sprite colours | 3+transparent | **15+transparent** (64-colour attached) |
| Sprite colors | 3+transparent | **15+transparent** (64-color attached) |
| Bitplane depth | 6 planes max | **8 planes** |
| Palette select | 1 bank | **4 bitplane banks, 4 sprite banks** |