This article prompted the following questions for me: 1. How well did the historical systems do, and why? Presumably non-negligible key travel is not a modern

This article prompted the following questions for me: 1. How well did the historical systems do, and why? Presumably non-negligible key travel is not a modern invention. 2. How much of the latency is key travel? (i.e. what korethr said) 3. How exactly were the keys pressed/how fast were they pressed? All the article says about the experimental setup is "The start-of-input was measured by pressing two keys at once – one key on the keyboard and a button that was also connected to the logic analyzer."