| Bits | Description |
|---|---|
| 7 | 1 Enable the tilemap (soft reset = 0) |
| 6 | 0 for 40x32, 1 for 80x32 (soft reset = 0) |
| 5 | Eliminate the attribute entry in the tilemap (soft reset = 0) |
| 4 | Palette select (soft reset = 0) |
| 3 | Select textmode (soft reset = 0) |
| 2 | Reserved, must be 0 |
| 1 | Activate 512 tile mode (soft reset = 0) |
| 0 | Force tilemap on top of ULA (soft reset = 0) |