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18
01_hardware/aga_a1200_a4000/chipset_aga.md
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@ -12,10 +12,10 @@ Alice is the successor to Super Agnus and is the DMA controller and Copper/Blitt
Alice can fetch 2 or 4 words per DMA cycle via the `FMODE` register ($DFF1FC). This dramatically increases the bandwidth available to the blitter and bitplane DMA.
**Extended bitplane depth:**
Alice supports up to **8 bitplanes** (256 colours), compared to OCS/ECS's 6-plane limit.
Alice supports up to **8 bitplanes** (256 colors), compared to OCS/ECS's 6-plane limit.
**BPLCON4:**
Alice adds `BPLCON4` to control bitplane bank selection — which 64-entry block of the 256-entry colour table is used by the bitplanes.
Alice adds `BPLCON4` to control bitplane bank selection — which 64-entry block of the 256-entry color table is used by the bitplanes.
### ALICE_ID
@ -34,18 +34,18 @@ lsr.w #8, d0
## Lisa (AGA Denise)
Lisa is the display chip successor to ECS Denise, providing 8-bit colour output (256 colour registers) and extended sprite capabilities.
Lisa is the display chip successor to ECS Denise, providing 8-bit color output (256 color registers) and extended sprite capabilities.
### Key Enhancements over ECS Denise
**256 colour registers:**
**256 color registers:**
Lisa provides COLOR00–COLOR255, each 24-bit (32-bit register with low byte unused).
**4 colour banks for bitplanes:**
`BPLCON4` selects which 64-register bank (0–3) the bitplanes use for lookup. This allows dual-playfield each using a different 64-colour palette.
**4 color banks for bitplanes:**
`BPLCON4` selects which 64-register bank (0–3) the bitplanes use for lookup. This allows dual-playfield each using a different 64-color palette.
**Sprite bank selection:**
`BPLCON3` bits select which colour bank sprite pairs use.
`BPLCON3` bits select which color bank sprite pairs use.
**Extended sprite width:**
Sprites can be 16 or 64 pixels wide in AGA mode.
@ -105,7 +105,7 @@ bits 14-12: BPU2-0 — lower 3 bits of bitplane count
bit 4: BPU3 — MSB of bitplane count (AGA: allows 7, 8 planes)
```
To use 8 bitplanes (256 colours):
To use 8 bitplanes (256 colors):
```asm
move.w #$9411, BPLCON0+custom ; HIRES=1 (if needed), BPU=8 (BPU3=1, BPU2-0=000), ECSENA=1
```
@ -123,4 +123,4 @@ move.w #$9411, BPLCON0+custom ; HIRES=1 (if needed), BPU=8 (BPU3=1, BPU2-0=000
- [Akiko — CD32 Custom Chip](akiko_cd32.md) — CD32-exclusive ASIC (C2P, CD-ROM, NVRAM) that sits alongside Alice/Lisa/Paula
- [AGA Blitter](aga_blitter.md) — 64-bit FMODE blitter details
- [AGA Palette](aga_palette.md) — 256-register 24-bit colour system
- [AGA Palette](aga_palette.md) — 256-register 24-bit color system