IBM 4300 Manual page 31

Hex Dec
0 0 Restart New PSW or IPL PSW
4 4
8 8 Restart Old PSW or IPL CCWl
C 12
10 16 IPL CCW2
14 20
18 24 External Old PSW
1C 28
20 32 Supervisor-Call Old PSW
24 36
28 40 Program Old PSW
2C 44
30 48 Machine-Check Old PSW
34 52
38 56 Input/Output Old PSW
3C 60
40 64 Channel-Status Word
44 68
48 72 Channel-Address Word
4C 76
50 80 Interval Timer
54 84
58 88 External New PSW
5C 92
60 96 Supervisor-Call New PSW
64 100
68 104 Program New PSW
6C 108
70 112 Machine-Check New PSW
74 116
78
120 Input/Output New PSW
7C
124
Assigned Storage Locations (Part 1 of 3)
(
3-12 IBM 4300 Processors Principles of Operation