The Model F Datamaster Desktop Keyboard was the first buckling springs keyboard released by IBM and is in fact an integrated assembly inside the IBM 5322 System/23 Datamaster computer. Released in July 1981, the general layout and physical assembly would be reused only a month later for the IBM 5150 Personal Computer as the Model F/XT. Whilst rare and its host computer very expensive, this keyboard has the honour of being the first of a very successful line of keyboards.