Semantic search
| Number | Readable | Writable | Description | |
|---|---|---|---|---|
| ULA Control Register | $68 | true | true | Disable ULA, controls ULA mixing/blending, enable ULA+ |
| Display Control 1 Register | $69 | true | true | Layer2, ULA shadow, Timex $FF port |
| LoRes Control Register | $6A | true | true | LoRes Radastan mode |
| Tilemap Control Register | $6B | true | true | Controls Tilemap mode. |
| Default Tilemap Attribute Register | $6C | true | true | Default tile attribute for 8-bit only maps. |
| Tilemap Base Address Register | $6E | true | true | Base address of the 40x32 or 80x32 tile map (similar to text-mode of other computers). |
| Tile Definitions Base Address Register | $6F | true | true | Base address of the tiles' graphics. |
| Layer 2 Control Register | $70 | true | true | Layer 2 resolution, palette offset |
| Layer 2 X Offset MSB Register | $71 | true | true | Sets the pixel offset used for drawing Layer 2 graphics on the screen. |
| Sprite port-mirror Attribute 0 (with INC) Register | $75 | false | true | Same as Sprite port-mirror Attribute 0 Register ($35) (write first byte of sprite-attributes), plus increments Sprite port-mirror Index Register ($34) |
| Sprite port-mirror Attribute 1 (with INC) Register | $76 | false | true | Same as Sprite port-mirror Attribute 1 Register ($36) (write second byte of sprite-attributes), plus increments Sprite port-mirror Index Register ($34) |
| Sprite port-mirror Attribute 2 (with INC) Register | $77 | false | true | Same as Sprite port-mirror Attribute 2 Register ($37) (write third byte of sprite-attributes), plus increments Sprite port-mirror Index Register ($34) |
| Sprite port-mirror Attribute 3 (with INC) Register | $78 | false | true | Same as Sprite port-mirror Attribute 3 Register ($38) (write fourth byte of sprite-attributes), plus increments Sprite port-mirror Index Register ($34) |
| Sprite port-mirror Attribute 4 (with INC) Register | $79 | false | true | The same as Sprite port-mirror Attribute 4 Register ($39) (write fifth byte of sprite-attributes), plus increments Sprite port-mirror Index Register ($34) |
| User Storage 0 Register | $7F | true | true | 8-bit storage for user |
| Expansion Bus Enable Register | $80 | true | true | Expansion bus enable/config |
| Expansion Bus Control Register | $81 | true | true | Expansion bus controls |
| Internal Port Decoding b0-7 Register | $82 | true | true | Enabling internal ports decoding |
| Internal Port Decoding b8-15 Register | $83 | true | true | Enabling internal ports decoding |
| Internal Port Decoding b16-23 Register | $84 | true | true | Enabling internal ports decoding |