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Hmm. My two years of high school programming (IBM VS-BASIC, with some FORTRAN, both G1 and WATFIV) were on a 370/135 running McGill University MUSIC, and we never had to worry about being swapped out while doing conversational I/O. There were front-end processors to take care of that.

Nor did I ever have to worry about that sort of thing at the University (various CDC Cybers running NOS, and a DEC PDP-11/70 running RSTS.

I never had to punch a single Hollerith card until I was back on a MUSIC system, doing a bit of work at my old high school (which by then had its own used 4341), and wanted a report to come out on the line printer, instead of on a much slower DECWriter (batch-submit from terminal sessions wasn't available).

It's a complete mystery to me, what people here are saying about having to jump through hoops to make terminal-based apps work on a mainframe: isn't the whole point of a timesharing OS, whether it uses sub-second timeslices, or it offloads terminal interaction to a front-end processor, and whether it's on a mainframe, a midrange, or even just a big micro, to create the illusion that each application has a whole box to itself?

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