not denying that Dune II was the first "successful" RTS but that Atari 800 game runs in real time (it is not turn based), you select units and tell them what to do (go to X, fire at Y) etc using the joystick to move a cursor and shortcut keys to select units and groups.
Here's one on the Atari 800
https://www.youtube.com/watch?v=7G5CEA_P9Hc
not denying that Dune II was the first "successful" RTS but that Atari 800 game runs in real time (it is not turn based), you select units and tell them what to do (go to X, fire at Y) etc using the joystick to move a cursor and shortcut keys to select units and groups.