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58 lines
1.8 KiB
Markdown
58 lines
1.8 KiB
Markdown
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[← Home](../README.md)
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# Hardware — Chipset Generation Overview
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## Generation Comparison
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| Feature | OCS | ECS | AGA |
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|---|---|---|---|
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| Agnus | 8361/8367 | 8372A (Super Agnus) | Alice (8374) |
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| Denise | 8362 | 8373 (ECS Denise) | Lisa |
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| Paula | 8364 | 8364 (unchanged) | 8364 (unchanged) |
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| Max Chip RAM | 512 KB–1 MB | 1–2 MB | 2 MB |
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| Colours (max normal) | 32 | 32 | 256 |
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| HAM | 12-bit HAM (6bpp) | 12-bit HAM | 24-bit HAM8 (8bpp) |
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| Sprites | 8 × 16px | 8 × 16px | 8 × 64px, 256 colours |
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| Blitter bus | 16-bit | 16-bit | 64-bit (FMODE) |
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| Display modes | NTSC/PAL | +Productivity, VGA | +Doublescan, 31kHz |
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| Machines | A500/A1000/A2000 | A600/A3000/A500+ | A1200/A4000/CD32 |
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---
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## Custom Register Address Space
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All chipset generations share the base address **$00DFF000** for custom registers. Registers are memory-mapped, mostly 16-bit wide.
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```
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$DFF000 BLTDDAT Blitter destination early read
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$DFF002 DMACONR DMA control (read)
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$DFF004 VPOSR Vertical position (read, high)
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...
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$DFF180 COLOR00 Colour register 0
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...
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$DFF1FE (last OCS/ECS register)
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$DFF1FC BEAMCON0 (ECS+) beam control
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$DFF1FC+ (AGA extensions)
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```
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See [custom_registers_full.md](../references/custom_registers_full.md) for the complete table across all chipsets.
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---
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## Navigation
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| Subfolder | Content |
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|---|---|
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| [common/](common/) | M68k CPU, address space layout, CIA chips, Zorro bus |
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| [ocs_a500/](ocs_a500/) | OCS chipset — A500, A1000, A2000 |
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| [ecs_a600_a3000/](ecs_a600_a3000/) | ECS chipset — A600, A3000, A500+ |
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| [aga_a1200_a4000/](aga_a1200_a4000/) | AGA chipset — A1200, A4000, CD32 |
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---
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## References
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- *Amiga Hardware Reference Manual* 3rd ed. — `Hardware_Manual_guide/` on ADCD 2.1
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- ADCD 2.1: http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node0000.html
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- AmigaMail Vol.2 — chipset programming articles
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