Page "IBM AIX" Paragraph 13

In 1988, IBM announced AIX / 370, also developed by Locus Computing.

AIX / 370 was IBM's third attempt to offer Unix-like functionality for their mainframe line, specifically the System / 370 ( the prior versions were a TSS / 370 based Unix system developed jointly with AT & T c. 1980, and VM / IX a VM / 370 based system developed jointly with Interactive Systems Corporation c. 1984 ).

AIX / 370 was released in 1990 with functional equivalence to System V Release 2 and 4. 3BSD as well as IBM enhancements.

With the introduction of the ESA / 390 architecture, AIX / 370 was replaced by AIX / ESA in 1991, which was based on OSF / 1, and also ran on the System / 390 platform.

This development effort was made partly to allow IBM to compete with Amdahl UTS.

Unlike AIX / 370, AIX / ESA ran both natively as the host operating system, and as a guest under VM.

AIX / ESA, while technically advanced, had little commercial success, partially because UNIX functionality was added as an option to the existing mainframe operating system, MVS, which became MVS / ESA OpenEdition in 1999.