- Entry:
- ATT
- VIT option:
- CIO
- Event:
- Attention
- VIT processing module:
- ISTRACCI
- Control is returned to:
- ISTTSCCA or ISTTSCLA
ATTI is written when an attention interrupt occurs for a channel-attached communication controller or an SNA cluster controller.
ATTL is written when an attention interrupt occurs for a channel-attached non-SNA device (device defined in a local non-SNA major node).
ATTT is written when an attention interrupt occurs for a TCP/IP DLC connection.
ATTX is written when an attention interrupt occurs for a channel-to-channel attachment, including an IBM® 3172 Interconnect Nways Controller.
For record types with suffix I, X, or T, the CIO events
are also captured within the NCB (pointed to by NCBCIOMV). The NCB
trace table is mapped by NCBCIOAR. 
- Byte (hex)
- Contents
- 00–03
- Record ID:
- C"ATTI" for ICNCB
- C"ATTL" for LDNCB
- C"ATTT" for RWNCB
- C"ATTX" for XCNCB
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05
- Link station state (NCBLNKST) for ICNCB, LDNCB, and RWNCB; station state (XCNSSFSM) for XCNCB
- 06
- CCW opcode or channel
- 07
- 0
- 08–0B
- Channel device name in EBCDIC (either a device address or device number)
- 0C–0F
- NCB address
- 10–13
- Flag bytes (NCBFLAGS)
- 14
- 0 or for ATTT:
- For the CDLC DLC: C
- For the LCS DLC: L
- For the CLAW DLC: W
- For the CTC DLC: X
- For the HYPERchannel DLC: H
- 15
- I/O completion code (IOSCOD in the IOSB)
- 16–17
- Sense data (IOSSNS of the IOSB)
- 18–1F
- Channel status word from the IOSB