RT timeline

1962-1983
RT-OS 1.0 (1962)

RT-OS 2.0 (1964)

RT-OS 3.0 (1966)

RT-OS 4.0 (1968)

RT-OS 4.5 (1970)

RT-OS 4.9 (1975)

RT-OS 5.0 (1980)

RT-OS 6.0 (1983)