> There is a preceding MODESET KEY=ZERO. It wouldn't make sense for that
to
> reset Control Register 3, turning on bit 0 and off bit 8, would it? "You
can
> set any SPK you want, so long as it is the one you already have."
The MODESET documentation says:
,MODE=PROB,
MODE=SUP
Specifies that the PSW problem state indicator
(bit 15) is to be either turned on (PROB) or turned off (SUP). If the
MODESET operation completes with a problem state PSW, the caller?s
PSW key mask (PKM) is set according to the following rules:
?The bit matching the resulting PSW key is set on.
?The bit matching key 9 is set on.
?For a task attached with ATTACHX using the KEY=NINE parameter, the
bits that were on in the PKM of the ATTACHX issuer are set on.
?All other bits are set off.
If the resulting PSW is in supervisor state, the caller?s PKM is
unchanged.
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp.
Poughkeepsie NY
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