▁added . ▁This ▁may ▁appear ▁rather ▁strange , ▁but ▁the ▁subtract ive ▁ad der ▁reduces ▁the ▁chance ▁of ▁getting ▁negative ▁zero ▁in ▁normal ▁operations . ▁ ▁The ▁machine ▁had ▁ 3 8 ▁instructions . ▁ ▁Inst ruction ▁set ▁ ▁See ▁also ▁List ▁of ▁UN IV AC ▁products ▁History ▁of ▁computing ▁hardware ▁ ▁References ▁ ▁External ▁links ▁ ▁Int rodu cing ▁the ▁E RA ▁ 1 1 0 1 : ▁An ▁operation ally ▁proven ▁high - speed , ▁electronic , ▁general ▁purpose ▁digital ▁computer , ▁E RA , ▁no - date . ▁( 8 ▁pp ) ▁ ▁Or al ▁history ▁inter views ▁with ▁E RA ▁personnel ▁on ▁ 1 1 0 1 , ▁Charles ▁B abb age ▁Institute , ▁University ▁of ▁Minnesota . ▁Inter view ees ▁include ▁Arnold ▁A . ▁C ohen ; ▁Arnold ▁Dum ey ▁; ▁John ▁L inds ay ▁Hill ; ▁Frank ▁M ull an ey ; ▁and ▁William ▁C . ▁Nor ris ▁. ▁E RA ▁ 1 1 0 1 ▁Document s ▁( archive ) ▁list ▁of ▁ 4 4 ▁sc anned ▁course ▁notes ▁on ▁ 1 1 0 1 ▁by ▁H . ▁C . ▁S ny der ▁US N ▁Sum mary ▁of ▁Character istics ▁Mag net ic ▁Dr um ▁Binary ▁Computer , ▁Engineering ▁Research ▁Associ ates ▁Pub ▁No . ▁ 2 5 , ▁ 3 0 ▁November ▁ 1 9 4 8 ▁▁ 1 1 0 1 ▁Category : E ar ly ▁computers ▁Category : Mil it ary ▁computers ▁Category : Comput er - related ▁introdu ctions ▁in ▁ 1