High-End Overlay Configuration Register 12
| CRKEY | Blender Chroma Key Enable |
| INV | Blender Inverted Blender Output Enable |
| ITER2BL | Blender Iterated Color Enable |
| ITER | Blender Use Iterated Color |
| REVALPHA | Blender Reverse Alpha |
| GAEN | Blender Global Alpha Enable |
| LAEN | Blender Local Alpha Enable |
| OVR | Blender Overlay Layer Enable |
| DMA | Blender DMA Layer Enable |
| REP | Use Replication logic to expand RGB color to 24 bits |
| DSTKEY | Destination Chroma Keying |
| VIDPRI | Video Priority |
| GA | Blender Global Alpha |