264-267 (Absolute Address)
Store-status Prefix Save Area:
During the store-status operation, the
contents of the prefix register,
if the multiprocessing facility
is installed, are stored at
locations 264-267.
268-271 (Absolute Address)
Store-Status Model-Dependent Save Area: During the execution store-status operation,
model-dependent information may be stored at locations 268-271.
352-383 (Absolute Address)
Store-Status Floating-Point­ Register Save Area: During the
execution of the store-status
operation, the contents of the floating-point registers, if the floating-point facility is
installed, are stored at locations 352-383.
352-383 (Real Address)
Machine-Check Floating-Point­
Register Save Area: During a machine-check interruption, the
contents of the floating-point
registers, if the floating-point
facility is installed, are stored at locations 352-383.
384-447 (Absolute Address)
Store-Status General-Register Save Area: During the execution
of the store-status operation,
the contents of the general
registers are stored at locations 384-447.
384-447 (Real Address)
Machine-Check General-Register Save Area: During a machine­
check interruption, the contents
of the general registers are stored at locations 384-447.
448-511 (Absolute Address)
Store-Status Control-Register
Save Area: During the execution store-status operation,
the contents of the control
registers are stored at
locations 448-511.
448-511 (Real Address)
795
Machine-Check Control-Register Save Area: During a machine­
check Tnterruption, the contents
of the control registers are
stored at 448-511.
(Logical Address) CPU Identity for DAS Tracing:
During execution of DAS tracing, the contents of location 795 are fetched and placed in the trace
entry. This field is called "CPU fdentity" because the control program is expected to place the rightmost eight bits
of the CPU address in this area.
Chapter 3. storage 3-45
Hex Dec 0 0 Initial-Program-loading PSW; or Restart New PSW 4 4
8 8 Initial-Program-loading CCWl; or Restart Old PSW C 12 10 16 Initial-Program-loading 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 Trace-Table-Designation Word
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)
3-46 System/370 Principles of Operation
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