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.
wˌɛn ɐ tˈɛlᵻtˌaɪp θˈɜːɾi θɹˈiː ˌeɪˌɛsˈɑːɹ ɪkwˈɪpt wɪððɪ ˌɔːɾəmˈæɾɪk pˈeɪpɚ tˈeɪp ɹˈiːdɚ ɹᵻsˈiːvd ɐ kəntɹˈoʊlˈɛs zˈɑːf, ɐn ɐbɹˌiːvɪˈeɪʃən fɔːɹ tɹænsmˈɪt ˈɔf, ɪt kˈɔːzd ðə tˈeɪp ɹˈiːdɚ tə stˈɑːp; ɹᵻsˈiːvɪŋ kəntɹˈoʊlkjˈuː ˌɛksˌoʊˈɛn, tɹænsmˈɪt ˌɔn kˈɔːzd ðə tˈeɪp ɹˈiːdɚ tə ɹᵻzˈuːm.