Data General RDOS

RDOS (Real-time Disk Operating System) was a real-time operating system released in 1972 for the popular Data General Nova and Eclipse minicomputers. RDOS was capable of multitasking, with the ability to run up to 32 what were called "tasks" (similar to the current term threads) simultaneously on each of two grounds (foreground and background) within a 64 KB memory space. Later versions of RDOS were compatible with Data General's 16-bit Eclipse minicomputer line.