In the 1970s and 1980s NMOS was favored owing to speed and area advantages, coupled with technology limitations and concerns related to isolation, parasitic effects and process complexity.
ɪnðə nˈaɪntiːnhˈʌndɹɪd sˈɛvənti z ænd nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi z ˈɛnmˈɑːs wʌz fˈeɪvɚd ˈoʊɪŋ tə spˈiːd ænd ˈɛɹiə ɐdvˈæntɪdʒᵻz, kˈʌpəld wɪð tɛknˈɑːlədʒi lˌɪmɪtˈeɪʃənz ænd kənsˈɜːnz ɹᵻlˈeɪɾᵻd tʊ ˌaɪsəlˈeɪʃən, pˌæɹəsˈɪɾɪk ɪfˈɛkts ænd pɹˈɑːsɛs kəmplˈɛksᵻɾi.