What happens when you press two Keys at the exact same time?

[Fabian9799]

I wondered what happens if you press 2 Keys at the exact same time. Will the Keyboard select a random Key or will it just send nothing to the pc

[orbitalbuzzsaw]

It should send both, if it doesn't somethings wrong with your keyboard, that's what key rollover is

[Fabian9799]

but is it randomly selecting what key it sends first?

[Fabian9799]

oh right. thanks for the answer

[Mira Yurizaki]

1 hour ago, Fabian9799 said:

I wondered what happens if you press 2 Keys at the exact same time. Will the Keyboard select a random Key or will it just send nothing to the pc

Keyboards are wired up in a grid-like fashion and the controller scans through the grid line by line. When you press a key, it completes a circuit that lets the signal travel out through another line. If you press two keys down at the same time, it'll send both keys, but in whatever order the scanning is done.

 

This video helps explain it (using the Commodore PET as an example since he was fixing it)

 

Edited August 29, 2018 by M.Yurizaki