▁a ▁close ▁variation , ▁the ▁ 8 0 9 6 , ▁was ▁extremely ▁popular . ▁ ▁The ▁major ▁difference ▁between ▁these ▁two ▁ch ips ▁was ▁the ▁external ▁instruction / data ▁bus . ▁ ▁Ford ▁wanted ▁to ▁minim ize ▁the ▁number ▁of ▁p ins ▁used ▁for ▁input ▁and ▁output ▁so ▁Intel ▁designed ▁a ▁unique ▁bus ▁( MB US ) ▁that ▁multiple x ed ▁address ▁and ▁data ▁onto ▁an ▁ 8 ▁bit ▁bus . ▁Several ▁additional ▁control ▁lines ▁were ▁used ▁for ▁transfer ring ▁information ▁on ▁this ▁bus . ▁ ▁Because ▁of ▁the ▁unique ▁nature ▁of ▁the ▁bus , ▁custom ▁memory ▁ch ips ▁were ▁required . ▁ ▁E EC - IV ▁first ▁appeared ▁on ▁the ▁ 1 9 8 3 ▁ 1 . 6 L ▁E FI , ▁ 2 . 3 L ▁High ▁Sw irl ▁Com b ust ion ▁( H SC ), ▁ 2 . 3 L ▁E FI ▁Tur bo ▁and ▁ 2 . 8 L ▁tr uck ▁engines . ▁With ▁the ▁Esc ort , ▁the ▁base ▁engine ▁was ▁the ▁same ▁as ▁all ▁US ▁Esc ort s , ▁the ▁ 1 . 6 L ▁CV H , ▁but ▁featured ▁unique ▁int ake ▁and ▁exhaust ▁manif olds ▁in ▁addition ▁to ▁E FI . ▁This ▁was ▁non - sequ ential ▁E FI , ▁meaning ▁ 1 / 4 ▁of ▁the ▁required ▁fuel ▁for ▁each ▁cyl inder ▁was ▁inject ed ▁into ▁the ▁int ake ▁manifold , ▁near ▁the ▁int ake ▁val ve ▁for ▁each ▁cyl inder ▁firing . ▁ ▁The ▁first ▁E EC - IV ▁module