Desktop design specifications have been given a variety of names of the years. The original Advanced Technology or AT design was developed in the early PC years with the IBM compatible systems. As the power requirements and layouts changed, the industry developed a new definition called Advanced Technology Extended or ATX. This specification has been used for many years. In fact it has undergone a large number of revisions through the years to deal with various power changes. Now a new format has been developed over the years called ATX12V.