I was originally dismissive of the Dartmouth ‘time sharing’ system. One could not interact with his running program. A few years later I studied it more closely and became highly impressed. Kemeny had produced a highly useful system with minuscule hardware. The turn-around time was quite small and that is immensely important. The editor ran on its own small machine and was simultaneously aware of all the terminals. A user interactively edited his source program at a terminal and interactively examined the output. Another slightly larger machine ran queued “batch jobs” with a short time limit.
I now consider that system a jewel of originality. I still don’t know whether to call it timesharing.