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Retrocomputing

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    Please note that it's insensitive to refer to a terminal as "dumb". All terminals deserve to have an equal opportunity to provide quality information technology services. It would be better to refer to the terminals that you speak of as "terminals that express formatting in alternative manners". Commented Aug 8, 2017 at 21:30
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    @halfbit The question is not wrong in any way - It's simply the answer that may be a bit trivial: Today, "protocol" would mean something like software framing, checksum fields and parity bits. In that sense, the answer is simply: none Commented Aug 9, 2017 at 7:28
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    @halfbit No, protocols don't need to follow the OSI seven layer model. Teletypes most certainly used protocols to talk to computers, just not as sophisticated as, say, TCP. Commented Aug 9, 2017 at 8:34
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    I believe @RobertColumbia meant "computationally challenged". Commented Aug 10, 2017 at 13:52
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    @halfbit, "protocol" is certainly not the wrong word. RS232 is a protocol. Voltage levels, currents, timing of signals are just as much a protocol as (off the top of my head) morse code, the Kerebos security protocol, TCP/IP etc etc. Commented Aug 11, 2017 at 10:22