Register 1 contains the address of the ARCSKEXT parameter list as shown in Table 1.
| Offset | Length or Bit Pattern | Description |
|---|---|---|
| 00 (X'00') | 4 | The address of a 44-byte area containing the name of the data set about to be recovered. |
| 04 (X'04') | 4 | The address of a fullword binary return code. |