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.
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.