Issue
a $QIO request with associated diagnostic buffer   | $QIO  | 
Modify
the number of interlocked queue retries   | $QIO request to an Ethernet 802 driver (DEBNA/NI)   | 
Set
the spin-wait time on the port command register   | $QIO request to an Ethernet 802 driver
(DEBNA)   | 
Access
the Diagnostic and Utilities Protocol (DUP) class driver  | $QIO request to the DUP class
driver used by SET HOST/HSC (FYDRIVER)  | 
Execute
a special passthrough function in the SCSI generic class driver   | $QIO request to the SCSI
driver (GKDRIVER)   | 
Process a diagnostic
buffer   | $QIO request to a TU58
magnetic tape (TUDRIVER)   |