This vintage Mitsumi Electric keyboard is a great addition to any collection of retro technology. With a 5-PIN AT connector, it is compatible with a range of vintage computers and mainframes. This keyboard has been tested and confirmed to be in good working condition. It is a classic example of a home computer keyboard from the past. This keyboard is perfect for anyone looking to add a touch of nostalgia to their computing setup. There is discoloration of the plastic.