| Bits | Description |
|---|
| 7:4 | Palette offset (soft reset = 0) |
| 3 | X mirror (soft reset = 0) |
| 2 | Y mirror (soft reset = 0) |
| 1 | Rotate (soft reset = 0) |
| 0 | ULA over tilemap (soft reset = 0)
(or bit 8 of the tile number if 512 tile mode is enabled) |
Notes:
Active if nextreg 0x6B bit 5 is set