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01_hardware/ocs_a500/copper.md
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@ -6,7 +6,7 @@
The **Copper** (co-processor) is built into Agnus. It executes a simple instruction list (the **copperlist**) in sync with the video beam, allowing precise per-scanline changes to any writable custom register — without CPU intervention.
The Copper can only write to custom registers (it cannot access Chip RAM directly), but it can change bitplane pointers, colours, BPLCON0, sprite pointers, and any other `$DFF0xx` register on a cycle-accurate basis.
The Copper can only write to custom registers (it cannot access Chip RAM directly), but it can change bitplane pointers, colors, BPLCON0, sprite pointers, and any other `$DFF0xx` register on a cycle-accurate basis.
## Copper Instruction Set
@ -59,7 +59,7 @@ A copperlist is an array of 32-bit instruction pairs in **Chip RAM**, terminated
DC.W $FFFF, $FFFE
```
Example — colour cycle on vertical blank:
Example — color cycle on vertical blank:
```asm
Copperlist:
DC.W $0180, $0000 ; COLOR00 = black
@ -110,7 +110,7 @@ Common copper techniques:
**BPLCON0 mid-screen:** Switch between `HIRES` and `LORES`, or between 6-plane and 4-plane modes, on different lines.
**Raster bars:** Write a different colour to COLOR00 on every scanline using sequential WAIT+MOVE pairs.
**Raster bars:** Write a different color to COLOR00 on every scanline using sequential WAIT+MOVE pairs.
## Graphics Library vs Direct Copper