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08_graphics/copper.md
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## Overview
The **Copper** is a simple coprocessor in the Amiga custom chips that executes a list of instructions synchronised to the video beam. It can write to any custom chip register at any beam position, enabling per-scanline colour changes, split screens, and hardware-level display effects without CPU intervention.
The **Copper** is a simple coprocessor in the Amiga custom chips that executes a list of instructions synchronized to the video beam. It can write to any custom chip register at any beam position, enabling per-scanline color changes, split screens, and hardware-level display effects without CPU intervention.
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## Standard Copper Patterns
### Per-Scanline Colour Change (Rainbow)
### Per-Scanline Color Change (Rainbow)
```
WAIT $2C01,$FFFE ; wait for line $2C (44)
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| Pointer | Description |
|---|---|
| `GfxBase->copinit` | System initialisation copper list |
| `GfxBase->copinit` | System initialization copper list |
| `GfxBase->LOFlist` | Long-frame copper list (even fields) |
| `GfxBase->SHFlist` | Short-frame copper list (odd fields, interlace) |