I want to know the answer to the following question:
What was the warning signal called that warned the sender that there was impending overflow?
All the background I'm provided with is that "When a Teletype 33 ASR equipped with the automatic paper tape reader received a Control-S (XOFF, an abbreviation for transmit off), it caused the tape reader to stop; receiving Control-Q (XON, "transmit on") caused the tape reader to resume.". Is that enough to answer the question?
Answer: no