PSA Mapping
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The PSA contains relevant information for the CPU to function.
| Name | Real Address | Usage |
|---|---|---|
| FLCESICODE | 0x8A | Service Call Interrupt code |
| FLCENPSW | 0x58 | External New PSW |
| FLCEOPSW | 0x18 | External Old PSW |
| FLCSNPSW | 0x60 | Service New PSW |
| FLCSOPSW | 0x20 | Service Old PSW |
| FLCMNPSW | 0x70 | Machine Check New PSW |
| FLCPNPSW | 0x68 | Program Check New PSW |
| FLCPOPSW | 0x28 | Program Check Old PSW |
| FLCIOA | 0xB8 | Booting device SCHID |
| FLCGRSAV | 0x180 | General Register Save Area. Used by the kernel to save problem-state space registers. |
| FLCCRSAV | 0x1C0 | Control Register Save Area. Used by the kernel to save kernel-space registers. |