IBM System/370 145 Reference Summary page 102

II
Table 2
Instruction Format (83--BDDDI Control-Storage Mode
MOOE ECC, RECORD, MAIN 8+D=000008
No Change
MODE ECC, QUIET, MAIN B+D=OOOOOC
No Change
MODE ECC, RECORD, CONT 8+D=000010
Record
MODE ECC, QUIET, CONT 8+D=000018
Quiet
MODE ECC, THRHOLD, CONT 8+D=000014 Threshold
Table 1 outlines the modes of taking machine-check interrup-
tions for recovery reports
without
taking
inU>
account the
operator mode commands.
Table 2 outlines how the mode commands affect the modes
of taking machine-check interruptions for recovery reports Note
that in record mode for main and control storage, only inter-
mittent single-bit failures result ma machine-check interruption.
The microprogram tests the fail mg storage location (main or
control) to see whether the single-bit failure is solid or inter-
mittent; if the failure 1s solid, the machine returns to processing
instructions and no machine-check interruption 1s taken.
CR 14
Main-Storage Mode
Bit4
Record No Change
Quiet
No Change
No Change
No Change
No Change No Change
No Change No Change
PSW
Sit 13
No Change
No Change
No Change
No Change
No Change
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