Editing RMX (operating system) (section)

==Overview==
Intel developed iRMX in the 1970s and originally released RMX/80 in 1976 and RMX/86 in 1980 to support and create demand for their processors and [[Multibus]] system platforms.<ref name="Ewing_1998"/>

The functional specification for RMX/86 was authored by Bruce Schafer and Miles Lewitt and was completed in the summer of 1978 soon after Intel relocated the entire Multibus business from [[Santa Clara, California]] to [[Aloha, Oregon]]. Schafer and Lewitt went on to each manage one of the two teams that developed the RMX/86 product for release on schedule in 1980.

Effective 2000 iRMX is supported, maintained, and licensed worldwide by [[TenAsys Corporation]], under an exclusive licensing arrangement with Intel.

iRMX is a layered design: containing a kernel, nucleus, basic I/O system, extended I/O system and human interface. An installation need include only the components required: intertask synchronization, communication subsystems, a filesystem, extended memory management, command shell, etc. The native filesystem is specific to iRMX, but has many similarities to the original [[Unix]] (V6) filesystem, such as 14 character path name components, file nodes, sector lists, application readable directories, etc.

iRMX supports multiple processes (known as jobs in RMX parlance) and multiple threads are supported within each process (task). In addition, interrupt handlers and threads exist to run in response to hardware interrupts. Thus, iRMX is a [[multi-processing]], [[Thread (computing)|multi-threaded]], pre-emptive, [[real-time operating system]] (RTOS).

===Commands===
The following list of [[command (computing)|command]]s are supported by iRMX 86.<ref>[https://archive.org/details/bitsavers_inteliRMX1_19819263 iRMX86 INTRODUCTION AND OPERATOR'S REFERENCE MANUAL For Release 6]</ref>

{{div col|colwidth=9em}}
* ATTACHDEVICE
* ATTACHFILE
* [[Backup|BACKUP]]
* [[COPY (command)|COPY]]
* CREATEDIR
* [[DATE (command)|DATE]]
* [[DEBUG (command)|DEBUG]]
* DELETE
* DETACHDEVICE
* DETACHFILE
* [[DIR (command)|DIR]]
* DISKVERIFY
* DOWNCOPY
* [[FORMAT (command)|FORMAT]]
* INITSTATUS
* JOBDELETE
* LOCDATA
* LOCK
* LOGICALNAMES
* MEMORY
* [[Path (computing)|PATH]]
* PERMIT
* [[REN (command)|RENAME]]
* RESTORE
* SUBMIT
* SUPER
* [[TIME (command)|TIME]]
* UPCOPY
* VERSION
* [[whoami|WHOAMI]]
{{div col end}}

===Historical uses===
iRMX III on Intel Multibus hardware is used in the majority core systems on CLSCS the [[London Underground]] [[Central line (London Underground)|Central line]] signals control system was supplied by Westinghouse (now [[Invensys]]) and commissioned in the late 1990s. The Central line is an automatic train operation line. Automatic train protection is by trackside and train borne equipment that does not use iRMX. It is the automatic train supervision elements that use a mix of iRMX on Multibus, and [[Solaris (operating system)|Solaris]] on [[SPARC]] computers. 16 iRMX local site computers are distributed along the Central line together with 6 central iRMX computers at the control centre. All 22 iRMX computers are dual redundant. {{As of|2011}} iRMX CLSCS continues in full operation.{{fact|date=December 2018}}{{Update inline|date=December 2018}}

[[Oslo Metro]] uses a similar, although less complex, Westinghouse-supplied iRMX control system through the central [[Common Tunnel]] tracks. This was expected to be decommissioned in 2011.{{fact|date=December 2018}}{{Update inline|date=December 2018}}