Uuummm, its not used that code since about 1990 when the processors changed from IBM360's to IBM370's.
It is quite true that the processors were changed around 1990 - which is when "9020" became "Host" or "HCS". As I recall, the name change was because the new processors (IBM4381s from memory) were "hosting" the old software.
Up until I stopped teaching FDP courses fairly recently, there were still "patches" in the system that had been there for a while.. I can even tell you who was responsible for writing them!!!
NAS IS an unwieldy system, and fully understanding it has always been a black art.
Mr Chips
So sad to not be working NAS anymore.....
