QElem *qLink; 4 0 Next queue entry short qType; 2 4 Queue type
short ioTrap; 2 6 Routine trap
Ptr ioCmdAddr; 4 8 Routine address ProcPtr ioCompletion; 4 12 Completion routine OSErr ioResult; 2 16 Result code long userData; 4 18 Command result (ATP user bytes)
short reqTID; 2 22 Request transaction ID
short ioRefNum; 2 24 Driver reference number
short csCode; 2 26 Call command code