So, as we all know, Grace spent 99.9% of her screen time tapping away on a typewriter, because, apparently, Equestria doesn't have computers. (And thank God for that.) But.... it only had two keys. Daring Do / A.K. Yearling also had a typewriter in her run-down home. So how exactly does the typing system work in Magical Horse Land?

Is it, like, morse code or binary or whatever?

3318172 Or they were just different typewriter models.

3318172 Magic, subtle subtle magic. The two buttons are for tactile response and ease of use. The machine uses a simple magic to read its users intent and place the appropriate mark on the paper