 The first modern computers were the massive code breaking machines of the Second World War ( such as Z3 , ENIAC and Colossus ) . The latter two of these machines were based on the theoretical foundation laid by Alan Turing and developed by John von Neumann . 
 The first modern computers <a href='uninflect' title='1'><mark>were</mark></a> the massive code breaking machines of the Second World War ( such as Z3 , ENIAC and Colossus ) . The latter two of these machines <a href='uninflect' title='2'><mark>were</mark></a> based on the theoretical foundation laid by Alan Turing and developed by John von Neumann . 
The first modern computers was the massive code breakin machines of da Second World War ( such as Z3 , ENIAC and Colossus ) . Tdalatter 2 of dese machines was based on the theoretical foundation laid by Alan Turing and developed by John von Neumann .