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Auxiliary storage for System/370 mode contains the following in the highest to the
lowest addressed locations:
•
UCW area for each instruction processing function with a minimum of 128 and
a maximum of 2048 UCWs
SIOF queuing area
•
I/ 0 trace area
Channel error logout area
Channel UCW directory area
•
Instruction tracing area
•
Channel data buffer reconfiguration test data
•
Restart text save area
Two internal records for the TEST BLOCK instruction (one for unusable
protect keys and one for unusable 4K-byte blocks)
•
Engineering/ scientific assist table
•
Program event recording area
Control storage link information
K-addressable auxiliary storage area of lK bytes. This area contains various
pointers and data fields used by the instruction processing functions (pointers
to the beginning of the other areas in auxiliary storage, the time-of-day clock,
the CPU timer, the clock comparator, the interval timer, for example).
For System/370-XA mode, auxiliary storage contains the following in the highest
to the lowest addressed locations:
Monitoring data area (32 bytes/subchannel)
•
I/
0
trace area
•
Channel error log
•
CRW (channel report word) queue
•
Subchannel area
Control unit block area (70 bytes/control unit)
Channel directories
Channel data buffer reconfiguration test data
I/
0
queuing information
Section 30: 4381 Processor Multiprocessor Model Groups
69
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