In addition, the original ASCII specification included 33 non-printing control codes which originated with s; most of these are now obsolete, although a few are still commonly used, such as the carriage return, line feed, and tab codes.
ɪn ɐdˈɪʃən, ðɪ ɚɹˈɪdʒɪnəl ˈæski spˌɛsɪfɪkˈeɪʃən ɪŋklˈuːdᵻd θˈɜːɾi θɹˈiː nˈɑːnpɹˈɪntɪŋ kəntɹˈoʊl kˈoʊdz wˌɪtʃ ɚɹˈɪdʒᵻnˌeɪɾᵻd wɪð ˈɛs; mˈoʊst əv ðiːz ɑːɹ nˈaʊ ˈɑːbsəlˌiːt, ɔːlðˈoʊ ɐ fjˈuː ɑːɹ stˈɪl kˈɑːmənli jˈuːzd, sˈʌtʃ ɐz ðə kˈæɹɪdʒ ɹᵻtˈɜːn, lˈaɪn fˈiːd, ænd tˈæb kˈoʊdz.