- Entry:
- IRBX
- VIT option:
- PSS
- Event:
- IRB exit
- VIT processing module:
- ISTRACPS
- Control is returned to:
- ISTAPCSD
This trace record provides information about an IRB exit.
Note: For this trace record to be created, in addition to
specifying the PSS option you must specify IRB or BOTH on the PSSTRACE
start option. 
- Byte (hex)
- Contents
- 00–03
- Record ID: C"IRBX"
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05–07
- 0
- 08–0B
- PST address
- 0C–0F
- New TCB address
- 10–13
- Old TCB address
- 14–17
- New ASCB address
- 18–1B
- Old ASCB address
- 1C–1F
- IRB address