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Boy, that brings back fond memories of IBM 360 mainframes in big, noisy, cold rooms.

I remember the transition from cards to online terminals, when hacking (as a high-school junior) at the Naval Electronic Labs computer center in Point Loma (San Diego) in the early 70's as a part-time systems programmer. (Don't remember how I got a job there, but I do remember adding some small features to their WATFOR Fortran compiler over one summer.)

TSO (time-sharing option) was a huge upgrade at the time, running as a permanent "job" under OS/360, and virtualizing the job partition to run separate sub-jobs per terminal user. After using punched cards for a while, the thrill of actually typing in programs directly (mostly assembler and PL/I in my case), running, and DEBUGGING them interactively was nirvana.

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