(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)