Real-Time Multiprogramming Operating System

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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]


  1. ^ a b GE-PAC 4020 Programming Manual (PDF). General Electric. 1967. p. 5. Retrieved 2013-09-27.
  2. ^ Spang, H. A. III (January 1972). "The structure and comparison of three real-time operating systems for process control". Automatica. 8 (1): 49–64. doi:10.1016/0005-1098(72)90009-X. Retrieved 23 August 2013.
  3. ^ Spang, H. A. III (1974). Measurement and Improvement of Memory Allocation in a Process Computer. 4th IFAC/IFIP International Conference on Digital Computer Applications to Process Control. 93. pp. 236–247. doi:10.1007/978-3-642-65796-2_20.