| Bits | Description |
|---|---|
| 7 | 1 for always else only when rom3 is present (0x0038) |
| 6 | 1 for always else only when rom3 is present (0x0030) |
| 5 | 1 for always else only when rom3 is present (0x0028) |
| 4 | 1 for always else only when rom3 is present (0x0020) |
| 3 | 1 for always else only when rom3 is present (0x0018) |
| 2 | 1 for always else only when rom3 is present (0x0010) |
| 1 | 1 for always else only when rom3 is present (0x0008) |
| 0 | 1 for always else only when rom3 is present (0x0000) |