mirror of
https://github.com/alfishe/amiga-bootcamp.git
synced 2026-06-13 00:26:28 +00:00
c4522ef2ed
New articles: - 01_hardware/common/memory_types.md: comprehensive Chip/Fast/Slow RAM reference with DMA accessibility matrix, per-model configurations (A500-A4000), accelerator memory expansion (classic + modern), adaptive software behavior, pitfalls with impact analysis, FPGA/emulation notes - AGENTS.md: documentation standards and methodology guidelines Blitter programming (08_graphics/blitter_programming.md): - Rewrote minterm truth table with narrative explanation and worked example - Added 7 advanced use cases with assembly/C code: shifted BOB, hardware scroll, area fill polygon, interleaved bitplane BOBs, double-buffered game loop, GUI window drag, tile map renderer - Added Good/Bad Patterns section with 5 named antipatterns - Added Practical Limitations table (10 constraints with workarounds) - Expanded Common Minterms table with Description and Real-World Use Case columns Cross-reference updates: - Root README: added memory types to coverage, quick start, section index - 01_hardware/README: updated common/ folder description - address_space.md: linked to memory_types.md and chip_ram_expansion.md - memory_management.md (exec): linked to hardware memory types reference - bitmap.md, sprites.md, animation.md, audio.md: linked to memory_types.md explaining DMA Chip RAM requirement for each subsystem - chip_ram_expansion.md: linked to comprehensive memory types article
57 lines
1.9 KiB
Markdown
57 lines
1.9 KiB
Markdown
[← Home](../README.md)
|
||
|
||
# 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](../references/custom_registers_full.md) for the complete table across all chipsets.
|
||
|
||
---
|
||
|
||
## Navigation
|
||
|
||
| Subfolder | Content |
|
||
|---|---|
|
||
| [common/](common/) | M68k CPU, address space layout, **memory types (Chip/Fast/Slow)**, CIA chips, Zorro bus |
|
||
| [ocs_a500/](ocs_a500/) | OCS chipset — A500, A1000, A2000 |
|
||
| [ecs_a600_a3000/](ecs_a600_a3000/) | ECS chipset — A600, A3000, A500+ |
|
||
| [aga_a1200_a4000/](aga_a1200_a4000/) | AGA chipset — A1200, A4000, CD32 |
|
||
|
||
---
|
||
|
||
## References
|
||
|
||
- *Amiga Hardware Reference Manual* 3rd ed. — `Hardware_Manual_guide/` on ADCD 2.1
|
||
- ADCD 2.1: http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node0000.html
|
||
- AmigaMail Vol.2 — chipset programming articles
|