The easiest way to fix your problem is to upgrade your graphics card to either tier 2 or 3 in order to increase the resolution and thus allow more characters to be displayed on your screen.
Another fix would be to type this code in your terminal:
os.sleep(0.5) for k,v in pairs(component.robot) do print(k,v) event.pull("key_up") end
This will print out each entry of the table and the value it's stored under every time you press and release a key, and would probably work for any other table.
You could also check out the code in the following pastebin [https://pastebin.com/5qB1UkZf], or run it directly in your OpenComputer computer with pastebin get and as input type robot.
If you have other questions or if you want me to explain something about what I wrote, what the individual functions do or if I didn't answer your question feel free to send me a private message. I feel OpenComputers is very poorly documented, at least for people with no experience in programming prior to ComputerCraft or OpenComputers like myself, so I'd be more than happy to help you out with the few things I do understand.