. ▁ ▁E EC ▁I ▁and ▁II ▁ ▁These ▁two ▁" modules " ▁used ▁a ▁common ▁processor ▁and ▁memory ▁so ▁they ▁can ▁be ▁described ▁together . ▁The ▁micro processor ▁was ▁a ▁ 1 2 - bit ▁central ▁processing ▁unit ▁manufact ured ▁by ▁T os hib a , ▁the ▁T L CS - 1 2 , ▁which ▁began ▁development ▁in ▁ 1 9 7 1 ▁and ▁was ▁completed ▁in ▁ 1 9 7 3 . ▁It ▁was ▁a ▁ 3 2 mm ² ▁chip ▁with ▁about ▁ 2 , 8 0 0 ▁sil icon ▁gates , ▁manufact ured ▁on ▁a ▁ 6 ▁ µ m ▁process . ▁The ▁system ' s ▁sem icon duct or ▁memory ▁included ▁ 5 1 2 - bit ▁RAM , ▁ 2 kb ▁R OM ▁and ▁ 2 kb ▁EP ROM . ▁The ▁system ▁began ▁production ▁in ▁ 1 9 7 4 , ▁and ▁went ▁into ▁mass ▁production ▁in ▁ 1 9 7 5 . ▁ ▁Ford ' s ▁internal ▁code ▁name ▁for ▁the ▁T L CS - 1 2 ▁micro processor ▁was ▁" PM - 1 1 " ▁or ▁" Po or ▁Man ' s ▁ 1 1 " ▁imp lying ▁it ▁was ▁a ▁stri pped ▁down ▁version ▁of ▁the , ▁then ▁popular , ▁Digital ▁Equ ip ment ▁Corporation ▁P DP - 1 1 ▁computer . ▁A ▁P DP - 1 1 ▁was ▁used ▁in ▁a ▁vehicle ▁in ▁the ▁first ▁half ▁of ▁the ▁ 1 9 7 0 s ▁for ▁" proof ▁of ▁concept ". ▁ ▁In ▁reality