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Jack Haverty wrote on its-hackers: > On MIT-DM, the most commonly used top-level program was called > "monit". It was used by most people instead of DDT because it required > less memory, which was a very scarce and precious commodity in the > early 70s before paging and swapping. In fact there was a lot of peer > pressure to use monit unless you had a very good reason to use DDT. This is a very old source file -- AI: SYSENG; MONIT 114 is listed in MAPS in 1971-04. Development happened on DM; "Scenarios for Using Arpanet at the International Conference on Computer Communication" has a 1972-09 transcript showing MONIT 192 on DM. The binary SYS; TS MONIT is listed on AI, MC and ML from 1971 to 1983 in MAPS, although it doesn't survive in the AI/MC KS10 dumps. A 1981 message to BUG-ITS from ED@MIT-ML suggests it was an old version: > ML:SYS;TS MONIT [...] does not have symbols nor the correct start > address (1300). It is pretty badly broken, but great fun to play with > nevertheless.