Type 1

The  TARDIS was an early prototype created by the elders of ancient Gallifrey. It was poorly designed, dangerous to operate and difficult to start. Some of them had minds of their own, with a history of escaping and roaming the universe. (PROSE: Heart of TARDIS) The Eleventh Doctor helped Rassilon with the first Type 1 TARDIS, and piloted it on its first flight through the Time Vortex. Panicked at the results of this flight, the Type 1 remained outside reality for a time, even attempting to generate anti-time energies to destroy the universe when it found itself unable to cope with the universe perceived through the Doctor's attempt to communicate with it through the telepathic circuits. However, when the other Doctors were drawn into the rift, they were able to convince the Type 1 to stop its efforts to destroy reality by linking the telepathic circuits of their TARDISes to the Type 1, allowing it to perceive the universe from the perspective of the Doctor's TARDIS rather than its initial perception. (COMIC: The Lost Dimension)

The Second Doctor discovered an old, decrepit woprat on a type-one TARDIS in an Avatar universe. (PROSE: Heart of TARDIS)