RMX (operating System) - DOS-RMX

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, MS-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 TSR to the MS-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. This combination provides RMX real-time functionality as well as full MS-DOS services.