The Valkyrie video chip is included in some Quadras and Performas. The Marathon games (2 and Infinity, at least) use this chip to blit 16-bit video.

| Register Name             | Offset |
|:-------------------------:|:------:|
| CLUT Address              | 0x4000 |
| CLUT Graphic              | 0x4004 |
| CLUT Video Data           | 0x4008 |
| CLUT Color Key            | 0x400C |
| Subsystem Config          | 0xA00C |
| Video In Control          | 0xA020 |
| Window X Start            | 0xA060 |
| Window Y Start            | 0xA064 |
| Window Width              | 0xA070 |
| Window Height             | 0xA074 |
| Video Field X Start       | 0xA080 |
| Video Field Y Start       | 0xA084 |