(S/370) An IBMmainframecomputer introduced in 1970 as a successOR to the IBM 360. Enhancements included the ability to suppORt virtual memORy and improved main stORage. Two models were available initially: 165 and 155, with cycle times of 80 and 115 nanoseconds. {Press Release (http://www-1.ibm.com/ibm/histORy/exhibits/mainframe/mainframe_PR370.html)}. (2004-06-06)