Joe Reichman wrote:
Shouldn't SAC 0 make PASN = HASN =SASN ????
No. You are confusing cross memory mode (PASN <> SASN <> HASN) with your ASC mode (two bits in the PSW that control whether Primary, Secondary or AR mode).
SAC merely sets the two PSW bits for ASC mode. It does nothing to PASN and SASN.
BTW, HASN isn't a hardware construct at all. It's strictly a z/OS concept. There are no hardware instructions to set that value.
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