The principal means of interacting with the 370 in 1986 were green-screen terminals that emulated punched cards. I think the terminals were made by Hazeltine; I'm pretty sure they weren't 3270s. The terminal ran in two "modes" -- a line-oriented editor mode and a command mode. Once you had completed entering your program, you pressed a "Submit" button and, a few moments later, received a JES2 message indicating that your "card deck" was successfully read. So the mainframe still thought it was being handed a deck of punched cards!
Off in the corner of the lab lurked half a dozen card readers/punchers. Every so often I'd turn in a lab on cards, just because I could. The profs hated it, of course -- they wanted to see continuous printout of your program's code and output.
Off in the corner of the lab lurked half a dozen card readers/punchers. Every so often I'd turn in a lab on cards, just because I could. The profs hated it, of course -- they wanted to see continuous printout of your program's code and output.
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