I have used this before years ago but I cannot swear that you will not find a key that does not always work. I tested the standard keys while it was hooked up to a dos machine and you can see the results on the screen of the main photo. Dip switches are set for auto AT/XT. Please note that the plastic has discolored on the front. The difference is really notable on the back where the feet are folded back into the board for it to lay flat.