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Interactive Application System. Multi-purpose multiprogramming system. This was a derivative of RSX11-D, with additional features to make it more of a time-sharing system. It also was specifically aimed at the 11/70, while RSX11-D was for the 18-bit machines like the 11/45. There is some suspicion that the intention was to make RSTS go away, but RSTS started supporting more languages than just BASIC and ended up outliving IAS.
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