Keyboard and Controller Tests — Keys, Rollover, Drift

Keyboards and controllers age in ways that are easy to feel but hard to prove: a key that registers four presses out of five, a space bar that chatters, a controller stick that drifts while you are not touching it. These tests turn those feelings into numbers — how many keys your board reports at once, how far a stick wanders at rest, and exactly which code each key sends. That evidence is what you need before a warranty claim, a repair or a replacement.