IBM System/390

The IBM System/390 is a discontinued mainframe product family implementing ESA/390, the fifth generation of the System/360 instruction set architecture. The first computers to use the ESA/390 were the Enterprise System/9000 (ES/9000) family, which were introduced in 1990. These were followed by the 9672, Multiprise, and Integrated Server families of System/390 in 1994–1999, using CMOS microprocessors. The ESA/390 succeeded ESA/370, used in the Enhanced 3090 and 4381 "E" models, and the System/370 architecture last used in the IBM 9370 low-end mainframe. ESA/390 was succeeded by the 64-bit z/Architecture in 2000.

"IBM ES/9000" redirects here. For the IBM System 9000 family of computers, originally announced in 1982 as the IBM Instruments Computer System Model 9000 laboratory computer/instrument controller, see IBM System 9000.
"s390" redirects here. For the ESA/390 architecture, referred to as "s390" on Linux, see ESA/390.
IBM System/390
Inside the IBM S/390 Parallel Enterprise Server Generation 4
ManufacturerInternational Business Machines Corporation (IBM)
Typemainframe (S/360-compatible)
Release dateSeptember 5, 1990 (1990-09-05)
DiscontinuedDecember 31, 2004
Operating systemMVS/ESA, OS/390, VSE/ESA and VM/ESA
MemoryES/9000: up to 2 GB main + 8 GB expanded
9672: up to 32 GB main (2 GB flat)
PredecessorIBM 3090, 4300 and 9370
SuccessorIBM Z
WebsiteOfficial website IBM Archives
"System/390 Announcement". IBM Archives. IBM. 23 January 2003. Retrieved 2017-01-29.
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