John W. Kennedy wrote:
(I wrote)
>> S0C0 is related to imprecise interrupts on the 360/91.
>> I thought I remembered it, but someone else remembered it
>> differently. I am not being more specific to avoid influencing
>> anyone else's memory of it. It should be in MVT era System
>> Codes manuals, but I can't find any that old, even on bitsavers.
>> It has been removed from later versions of the manual.
> /Multiple/ (simultaneous) imprecise interrupts, I think. You might find
> a more exact description in a 91 (or 95 or 195) Functional
> Characteristics manual.
The imprecise interrupt and multiple imprecise interrupt are
described, but not which message you get.
I believe that it is, as you say, multiple imprecise interrupts
that generate S0C0, otherwise with ordinary (single) imprecise
interrupts you get the normal S0Cx with x>0. You can't tell
that from the Functional Characteristics manual, though.
I think, though, that once you get the first interrupt it is very
easy to get additional ones as other instructions are completed
before the interrupt.
thanks,
-- glen
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