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IBM ESA/390
IBM ESA/390 (Enterprise Systems Architecture/390) has been introduced in the 1990s 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.
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