IBM 3745 Series, Hardware Maintenance Reference

Page: 50 / 712

┌────┐
│Time│
└─┬──┘
│ ┌───────┐
│ │Level 5│
│ └───────┘
│ │ Interrupt Request
│ │ Level 4 ┌───────┐
│ └──────────────────────5│Level 4│
│ Branch to Level 4 └───────┘
│ Start Address │
│ │ Interrupt Request
│ │ Level 2 ┌───────┐
│ └────────────────────5│Level 2│
│ Branch to Level 2 └───┬───┘
│ Start Address │
│ │
│ 6
│ No Higher Request ┌───────┐
│ ┌─────────────────────│ Exit │
│ 6 Return to └───────┘
│ ┌───────────┐ Level 4
│ ┌────────────────────│ Exit │
│ │ Return to Level 5 │Instruction│
│ │ └───────────┘
│ │
│ 6
│ Wait for Next
6 Interrupt Request
Interrupt Request Sources
Interrupt Level 1
Adapter level 1 request (error)
Address compare level 1
Address exception level 1
Level 5 I/O check level 1
Protection check level 1
Invalid operation check level 1
IPL request level 1
MOSS inoperative level 1
Hard error level 1 (Note 1)
I/O parity error
I/O time-out error
Interrupt Level 2
Adapter level 2 request (LA)
Program-controlled interrupt level 2
MOSS diagnostic level 2
Interrupt Level 3
Adapter level 3 request (CA)
MOSS diagnostic level 3
Interval timer level 3
Program-controlled interrupt level 3
Panel interrupt request level 3
Interrupt Level 4
Adapter level 4 request (not used)
Program-controlled interrupt level 4
MOSS request SVC level 4
MOSS request response level 4
SVC level 4 (call from level 5)
Level 5 No interrupt (first entry)
2-8
IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference