IBM 370

from The Free On-line Dictionary of Computing (8 July 2008)

System/370
IBM 370

   <hardware, IBM> (S/370) An {IBM} {mainframe} {computer}
   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)