Editing IBM AIX (section)

==={{anchor|AIX/370|AIX/ESA|AIX/390}}IBM mainframes===
In 1988, IBM announced '''AIX/370''',<ref name=ENUS288-130>{{cite web
 |title        = Advanced Interactive Executive/370 (AIX (TM)/370)
 |id           = 288-130
 |date         = March 15, 1988
 |url          = https://www.ibm.com/docs/en/announcements/archive/ENUS288-130
 |type         = Announcement letter
 |publisher    = [[IBM]]
 |access-date  = January 19, 2025
}}</ref> also developed by Locus. AIX/370 was IBM's fourth attempt to offer [[Unix-like]] functionality for their mainframe line, specifically the [[IBM System/370|System/370]] (the prior versions were a [[TSS (operating system)|TSS/370]]-based Unix system developed jointly with AT&T c.1980,<ref name="att-s370-unix"/> a [[VM/370]]-based system named '''VM/IX''' developed jointly with ISC c.1984,{{citation needed|date=June 2018}} and a [[VM/370]]-based version of TSS/370{{citation needed|date=November 2021}} named '''IX/370''' which was upgraded to be compatible with [[UNIX System V]]{{citation needed|date=June 2018}}). 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 [[IBM System/390|ESA/390]] architecture, AIX/370 was replaced by '''AIX/ESA'''<ref name=ENUS292-183>{{cite web
 |title        = IBM AIX/ESA Version 2 Release 1
 |id           = 292-183
 |date         = March 31, 1992
 |url          = https://www.ibm.com/docs/en/announcements/archive/ENUS292-183
 |type         = Announcement letter
 |publisher    = IBM
 |access-date  = January 19, 2025
}}</ref> in 1991 based on [[OSF/1]], and also runs on the [[IBM System/390|System/390]] platform. Unlike AIX/370, AIX/ESA runs both natively as the host operating system, and as a guest under [[VM (operating system)|VM]].  AIX/ESA, while technically advanced, had little commercial success, partially because{{Citation needed|date=June 2008}} UNIX functionality was added as an option to the existing mainframe operating system, [[MVS]], as [[MVS/ESA|MVS/ESA SP Version 4 Release 3 OpenEdition]]<ref>{{citation
 |title        = OpenEdition(TM) services Available on MVS/ESA SP Version 4 Release 3 (JES2 and JES3)
 |id           = ZP94-0246
 |date         = March 8, 1994
 |url          = https://www.ibm.com/docs/en/announcements/archive/ENUSZP94-0246
 |type         = Announcement letter
 |publisher    = IBM
 |access-date  = January 19, 2025
}}</ref> in 1994, and continued as an integral part of MVS/ESA SP Version 5, OS/390 and z/OS, with the name eventually changing from ''OpenEdition'' to ''Unix System Services''. IBM also provided OpenEdition in VM/ESA Version 2<ref>{{cite web
 |title        = Availability: VM/ESA Version 2 Release 1.0 with OpenEdition for VM/ESA
 |id           = 295-240
 |date         = June 12, 1995
 |url          = https://www.ibm.com/docs/en/announcements/archive/ENUS295-240
 |type         = Announcement letter
 |publisher    = IBM
 |access-date  = January 19, 2025
}}</ref> through z/VM.
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