Editing RMX (operating system) (section)

==={{anchor|DOS}}DOS-RMX===
DOS-RMX is a variant of the standalone iRMX operating system designed to allow two operating systems to share a single hardware platform. In simplest terms, [[DOS]] and iRMX operate concurrently on a single [[IBM PC compatible]] computer, where iRMX tasks (processes) have scheduling priority over the DOS kernel, interrupts, and applications. iRMX events (e.g., hardware interrupts) pre-empt the DOS kernel to ensure that tasks can respond to real-time events in a time-deterministic manner. In a functional sense, DOS-RMX is the predecessor to iRMX for Windows and INtime.

In practice, DOS-RMX appears as a [[Terminate-and-stay-resident]] (TSR) program to the DOS kernel. Once loaded as a TSR, iRMX takes over the CPU, changing to [[protected mode]] and running DOS in a [[virtual machine]] within an RMX task. <!-- A DOS-RMX library is included to facilitate the exchange of data and coordinate activities between tasks running on the iRMX kernel and applications running on the DOS kernel. --> This combination provides RMX real-time functionality as well as full DOS services.