Cybernetic Personality Matrix Interface (CPMI)
This Interface was installed only on Type 51 TARDISes.
The CPM Interface is able to verbally interact with the operators and acts as a lesion with the TARDIS's Artron Center.
The CPMI is capable of controlling all the TARDIS's functions (assuming the Automatic Systems Override hasn't been thrown). There was a basic design flaw in the system that caused the CPMI to develop new personalities.