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Mano prietaiso nustatymai: 9600 8N1, flow control?

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On ancient teletypes with a paper tape reader, receipt of a control-Q would turn on the paper tape reader and start sending out characters from the tape as though they had been typed at the keyboard. Control-S would turn off the paper tape reader. If one considers that teletypes were originally intended not to print data from computers, but rather from other teletypes, it should be pretty clear how “turn off paper tape reader” could be construed as analogous to “request other end to stop transmitting”.
Incidentally, control-R would turn on the paper-tape punch, such that every character received by the teletype (or, if local echo was enabled, typed at the keyboard) would also get punched to the paper tape; control-T would turn off the paper-tape punch. Unlike the operations associated with control-S and control-Q, however, those operations seem to have no modern equivalent.
Also, the original names for control-Q/R/S/T were DC1/DC2/DC3/DC4 (“Device Control 1”, etc.). While I’m not certain of the history, such naming would suggest that originally they were intended to trigger some unspecified kind of action, but the most common thing people did with DC1 and DC3 was to control the paper tape reader.


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