Offset | Length | Value | Description | |
0h | 2h | AA55h | Signature | Standard |
2h | 1h | Varies | Option ROM Length | Standard |
3h | 4h | Varies | Initialization Vector | Standard |
7h | 13h | Varies | Reserved | Standard |
1Ah | 2h | Varies | Offset to Expansion Header Structure | New for Plug and Play |