Editing IBM AIX (section)

===IBM RT PC===
The original AIX (sometimes called '''AIX/RT''') was developed for the IBM RT PC workstation by IBM in conjunction with [[Interactive Systems Corporation]], who had previously ported [[UNIX System III]] to the [[IBM PC]] for IBM as [[PC/IX]].<ref name="CW86"/> According to its developers, the AIX source (for this initial version) consisted of one million lines of code.<ref>{{cite journal|title=IBM joins 32-bit fray with RT line|journal=Computerworld: The Newsweekly of Information Systems Management|url=https://books.google.com/books?id=33QfOHT69aMC&pg=PA8|date=January 27, 1986|publisher=Computerworld|page=8|issn=0010-4841|access-date=May 18, 2016|archive-date=February 27, 2017|archive-url=https://web.archive.org/web/20170227082806/https://books.google.com/books?id=33QfOHT69aMC&pg=PA8|url-status=live}}</ref> Installation media consisted of eight [[Floppy disk|1.2M floppy disk]]s.  The RT was based on the [[IBM ROMP]] [[microprocessor]], the first commercial [[RISC]] chip. This was based on a design pioneered at IBM Research (the [[IBM 801]]).

One of the novel aspects of the RT design was the use of a [[microkernel]], called Virtual Resource Manager (VRM).  The keyboard, mouse, display, disk drives and network were all controlled by a microkernel.  One could "hotkey" from one operating system to the next using the Alt-Tab key combination. Each OS in turn would get possession of the keyboard, mouse and display. Besides AIX v2, the [[PICK OS]] also included this microkernel.

Much of the AIX v2 kernel was written in the [[PL.8]] programming language, which proved troublesome during the migration to AIX v3.{{Citation needed|date=June 2008}}  AIX v2 included full [[TCP/IP]] networking, as well as [[Systems Network Architecture|SNA]] and two networking file systems: [[Network File System (protocol)|NFS]], licensed from [[Sun Microsystems]], and [[Distributed Services]] (DS).  DS had the distinction of being built on top of SNA, and thereby being fully compatible with DS on {{clarify|text=IBM mainframe systems|reason=which operating systems?|date=October 2021}} and on midrange systems running [[OS/400]] through [[IBM i]].  For the graphical user interfaces, AIX v2 came with the X10R3 and later the X10R4 and X11 versions of the [[X Window System]] from MIT, together with the [[Xaw|Athena widget set]].  Compilers for [[Fortran]] and [[C (programming language)|C]] were available.