Input registers
Upon entry to CAZAPI01, the general purpose registers (GPRs) contain:
| Register | Contents |
|---|---|
| 1 | Address of a standard CALL parameter list. |
| 13 | Address of a standard register 72-byte save area that must be addressable in primary mode and below the bar. |
| 14 | Return address. |
| 15 | Entry address of CAZAPI01. |