It took until 1985 for IBM to offer its own Unix on the S/370 platform, IX/370, which was developed by Interactive Systems Corporation and intended by IBM to compete with Amdahl UTS. In the process, IBM made modifications to the TSS/370 hypervisor to better support Unix. IBM's own involvement in Unix can be dated to 1979, when it assisted Bell Labs in doing its own Unix port to the 370 (to be used as a build host for the 5ESS switch's software). This port would later grow out to become UTS, a mainframe Unix offering by IBM's competitor Amdahl Corporation. By 1976, the operating system was in use at various academic institutions, including Princeton, where Tom Lyon and others ported it to the S/370, to run as a guest OS under VM/370. Unix started life at AT&T's Bell Labs research center in the early 1970s, running on DEC minicomputers. ĪIX was the first operating system to have a journaling file system, and IBM has continuously enhanced the software with features such as processor, disk and network virtualization, dynamic hardware resource allocation (including fractional processor units), and reliability engineering ported from its mainframe designs. Older versions were previously certified to the UNIX 95 and UNIX 98 marks. It is certified to the UNIX 03 and UNIX V7 marks of the Single UNIX Specification, beginning with AIX versions 5.3 and 7.2 TL5 respectively. It is currently supported on IBM Power Systems alongside IBM i and Linux.ĪIX is based on UNIX System V with 4.3BSD-compatible extensions. Originally released for the IBM RT PC RISC workstation in 1986, AIX has supported a wide variety of hardware platforms, including the IBM RS/6000 series and later Power and PowerPC-based systems, IBM System i, System/370 mainframes, PS/2 personal computers, and the Apple Network Server.
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