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![]() Inside the IBM S/390 Parallel Enterprise Server Generation 4 | |
Manufacturer | International Business Machines Corporation (IBM) |
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Type | mainframe (S/360-compatible) |
Release date | September 5, 1990 |
Discontinued | December 31, 2004[1] |
Operating system | MVS/ESA, OS/390, VSE/ESA and VM/ESA |
Memory | ES/9000: up to 2 GB main + 8 GB expanded 9672: up to 32 GB main (2 GB flat) |
Predecessor | IBM 3090, 4300 and 9370 |
Successor | IBM Z |
Website | Official website IBM Archives "System/390 Announcement". IBM Archives. IBM. 23 January 2003. Retrieved 2017-01-29. |
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.