http://www.computerhistory.org/revol...omputers/7/166 http://www.computerhistory.org/revol...omputers/7/166 http://www.computerhistory.org/revol...omputers/7/166 http://www.computerhistory.org/revol...omputers/7/166 http://www.computerhistory.org/revol...omputers/7/166 mainframe computers