Electric typewriters, notably the IBM Selectric (1961), used a somewhat different layout that has become de facto standard on computers following the IBM PC (1981), especially Model M (1984) and thus shift values for symbols on modern keyboards do not correspond as closely to the ASCII table as earlier keyboards did.
ᵻlˈɛktɹɪk tˈaɪpɹaɪɾɚz, nˈoʊɾəbli ðɪ ˌaɪbˌiːˈɛm sᵻlˈɛktɹɪk nˈaɪntiːnhˈʌndɹɪd sˈɪksti wˈʌn, jˈuːzd ɐ sˈʌmwʌt dˈɪfɹənt lˈeɪaʊt ðæt hɐz bɪkˌʌm də fˈæktoʊ stˈændɚd ˌɔn kəmpjˈuːɾɚz fˈɑːloʊɪŋ ðɪ ˌaɪbˌiːˈɛm pˌiːsˈiː nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi wˈʌn, ɪspˈɛʃəli mˈɑːdəl ˈɛm nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi fˈoːɹ ænd ðˈʌs ʃˈɪft vˈæljuːz fɔːɹ sˈɪmbəlz ˌɔn mˈɑːdɚn kˈiːboːɹdz duːnˌɑːt kˌɔːɹɪspˈɑːnd æz klˈoʊsli tə ðɪ ˈæski tˈeɪbəl æz ˈɜːlɪɚ kˈiːboːɹdz dˈɪd.