On 2017-01-10, at 17:46, David W Noon wrote: > >> And how would you preserve one of the aboriginal design objectives of OS/360: >> the ability to ENQ all needed resources before job initiation to avoid >> deadlocks. > > That went out the window with the arrival of MVS/370, which introduced > SVC 99. > History question: Didn't DAIR, with similar function, antedate MVS/370?
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