For each device, there is an eight-byte entry with the following format:
Offsets | Name | Length | Format | Description | |
---|---|---|---|---|---|
0 | 0 | TDDEXCP | 8 | Structure | Data set access information. Note: Virtual
I/O devices are identified by the following:
It is important to understand the following:
For example, the messages:
|
0 | 0 | TDDDEVC | 1 | binary | Device class. |
1 | 1 | TDDUTYP | 1 | binary | Unit type. |
2 | 2 | TDDCUAD | 2 | binary | Device number. |
4 | 4 | TDDNEXCP | 4 | binary | EXCP count (see offset 44). |