(S/370) ANIBMmaiNframecomputer 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)