Real-Time Multiprogramming Operating System

Real-Time Multiprogramming Operating System (RTMOS) was a 24-bit process control operating system developed in the 1960s by General Electric^[1] that supported both real-time computing and multiprogramming.^[2][3] Programming was done in assembly language or Process FORTRAN. The two languages could be used in the same program, allowing programmers to alternate between the two as desired.^[1]

Multiprogramming operating systems are now considered obsolete, having been replaced by multitasking.^{[citation needed]}