I was contacted by two different teams via phone for "get to know you" calls.

I received a technical follow-up call from one of the teams that did not go very well. It was my mistake that I wasn't very prepared, so study up on things you think you already know!

Then I came in for a long day of interviews with people from the other team. I think there were six different interviews, ranging from technical puzzles to coding to questions on how I work with others.

The environment was very relaxed, casual, and pretty comfortable. Because of my first screw-up on the phone, I had put in a week's worth of hard studying/reviewing, so I was well prepared for these interviews, and they went really well.

What exactly happens in a computer system when there's a keyboard input interrupt, and how does the CPU process that instruction?