IBM Enterprise Systems Architecture is an instruction set architecture introduced by IBM as ESA/370 in 1988. It is based on the IBM System/370-XA architecture
1970s. Enterprise Systems Architecture/390 (ESA/390) was IBM's last 31-bit-address/32-bit-data mainframe computing design, copied by Amdahl, Hitachi, and Fujitsu
2024-09-19. IBM 4300 Processors Principles of Operation for ECPS:VSE Mode (PDF) (Second ed.). IBM. September 1980. GA22-7070-1. S390-ESA, pp. 1-13 – , 1–14
architecture, 32-bitcomputing refers to computer systems with a processor, memory, and other major system components that operate on data in 32-bit units. Compared
8-bit byte addressing and fixed point binary, fixed point decimal and hexadecimal floating-point calculations. The System/360 family introduced IBM's Solid