IBM ES/9000
↑ http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_FS9000.html IBM ES/9000 Characteristics. Retrieved on 17-09-2007.
↑ http://www-03.ibm.com/servers/eserver/zseries/zvse/about/history1990s.html z/VSE Operating System - History. Retrieved on 17-09-2007.