High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! ESA/390 (Enterprise Systems Architecture/390) was introduced in September 1990 and is IBM's last 31-bit- address/32-bit-data mainframe computing design, copied by Amdahl, Hitachi, and Fujitsu among other competitors. It was the successor of System/370 and has been succeeded by the 64-bit z/Architecture in 2000. Machines supporting the architecture have been sold under the brand System/390 (S/390) from the beginning of the 1990s. It was the only IBM mainframe architecture implemented first with bipolar and later with CMOS CPU electronics.

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