More content added

01_hardware/aga_a1200_a4000/aga_registers_delta.md

@@ -10,16 +10,16 @@ DMA fetch mode — see [chipset_aga.md](chipset_aga.md) for full description.
 
 ### BPLCON4 — $DFF10C (AGA only)
 
-Bitplane and sprite colour bank selection:
+Bitplane and sprite color bank selection:
 
 ```
-bits 15-8:  BPLAM7-0  — Bitplane XOR pattern (AGA colour bank XOR)
-bits  7-4:  ESPRM7-4  — Even sprite colour bank (bits 7:4 of colour reg index)
-bits  3-0:  OSPRM7-4  — Odd sprite colour bank
+bits 15-8:  BPLAM7-0  — Bitplane XOR pattern (AGA color bank XOR)
+bits  7-4:  ESPRM7-4  — Even sprite color bank (bits 7:4 of color reg index)
+bits  3-0:  OSPRM7-4  — Odd sprite color bank
 ```
 
 **Bitplane bank select via BPLAM:**
-- BPLAM provides an XOR mask applied to the 8-bit colour index before palette lookup
+- BPLAM provides an XOR mask applied to the 8-bit color index before palette lookup
 - BPLAM = $00 → use COLOR00–COLOR63 (bank 0)
 - BPLAM = $40 → use COLOR64–COLOR127 (bank 1)
 - BPLAM = $80 → use COLOR128–COLOR191 (bank 2)
@@ -27,14 +27,14 @@ bits  3-0:  OSPRM7-4  — Odd sprite colour bank
 
 ### COLOR00–COLOR255 — $DFF180–$DFF3BE (AGA)
 
-AGA extends the colour table from 32 registers (OCS/ECS) to **256 registers**.
+AGA extends the color table from 32 registers (OCS/ECS) to **256 registers**.
 
-Each AGA colour register is 32 bits (accessed as two word writes via BPLCON3 latch):
+Each AGA color register is 32 bits (accessed as two word writes via BPLCON3 latch):
 
 ```asm
-; Write 24-bit colour to COLOR00:
+; Write 24-bit color to COLOR00:
 ; First write sets high nibble, second sets low nibble
-move.w  #$0000, BPLCON3+custom      ; set LACE=0, select low colour word
+move.w  #$0000, BPLCON3+custom      ; set LACE=0, select low color word
 move.w  #$0FFF, COLOR00+custom      ; write $RGB (high 12 bits)
 bset    #9, BPLCON3_shadow           ; set LOCT (low nibble enable)
 move.w  #$0FFF, COLOR00+custom      ; write low nibble of each channel
@@ -47,7 +47,7 @@ The standard `LoadRGB32()` and `LoadRGB4()` graphics library calls manage this t
 ### BPLCON2 — $DFF104 (AGA extended)
 
 ```
-bits 14-9:  KILLEHB  — kill EHB mode (AGA replaces EHB with 256 colour)
+bits 14-9:  KILLEHB  — kill EHB mode (AGA replaces EHB with 256 color)
 bit    6:   RDRAM    — read bitplane data from RAM (not registered in Lisa)
 bits   5-3: PF2PRI   — playfield 2 priority
 bits   2-0: PF1PRI   — playfield 1 priority + sprite priority
@@ -57,7 +57,7 @@ bits   2-0: PF1PRI   — playfield 1 priority + sprite priority
 
 Additional AGA bits:
 ```
-bit 9:    LOCT  — low colour write enable (for 24-bit colour access)
+bit 9:    LOCT  — low color write enable (for 24-bit color access)
 bit 3:    BRDSPRT — sprites visible in border
 ```
 
@@ -65,28 +65,28 @@ bit 3:    BRDSPRT — sprites visible in border
 
 See [chipset_aga.md](chipset_aga.md) — bit 4 is the MSB of the bitplane count for 7/8-plane modes.
 
-## Colour Register Access — Low Nibble Protocol
+## Color Register Access — Low Nibble Protocol
 
-Writing 24-bit colour to AGA registers requires two steps per colour:
+Writing 24-bit color to AGA registers requires two steps per color:
 
 1. **Write high nibble** (standard): `COLOR00 = $0RGB` (bits [11:0] = R[3:0], G[3:0], B[3:0])
 2. **Set LOCT** in BPLCON3 (bit 9)
 3. **Write low nibble**: `COLOR00 = $0rgb` (bits [11:0] = R[3:0], G[3:0], B[3:0], these are the low 4 bits)
 
-This two-write sequence gives 8 bits per channel (R[7:0], G[7:0], B[7:0]) = 24-bit colour.
+This two-write sequence gives 8 bits per channel (R[7:0], G[7:0], B[7:0]) = 24-bit color.
 
 `LoadRGB32()` does this automatically:
 ```c
-/* AGA 32-bit colour table format:
-   Count, then pairs: [colour_index, 0x00RRGGBB] */
-ULONG colour_table[] = {
-    32,   0,         /* 32 colours starting at index 0 */
+/* AGA 32-bit color table format:
+   Count, then pairs: [color_index, 0x00RRGGBB] */
+ULONG color_table[] = {
+    32,   0,         /* 32 colors starting at index 0 */
     0x00FF0000,      /* COLOR00 = red */
     0x0000FF00,      /* COLOR01 = green */
     /* ... */
     ~0UL             /* terminator */
 };
-LoadRGB32(vp, colour_table);
+LoadRGB32(vp, color_table);
 ```
 
 ## References
@@ -94,4 +94,4 @@ LoadRGB32(vp, colour_table);
 - ADCD 2.1 Hardware Manual — AGA register appendix
 - NDK39: `hardware/custom.h`, `graphics/view.h`
 - Commodore A1200/A4000 Technical Reference Manuals
-- AmigaMail Vol. 2 — AGA colour programming
+- AmigaMail Vol. 2 — AGA color programming