The majority of the parameter packet fields are output fields for this function. The exception is the ParmLength field, which is both input and output.

┌─────────────────────────────────────────┐
│Field             Length     C Datatype  │
├─────────────────────────────────────────┤
│ParmLength        WORD       USHORT      │
├─────────────────────────────────────────┤
│BIOSFlags         WORD       USHORT      │
├─────────────────────────────────────────┤
│BIOSVersion       WORD       USHORT      │
├─────────────────────────────────────────┤
│SubsysVersion     WORD       USHORT      │
└─────────────────────────────────────────┘


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