The Master's TARDIS

The Master appears to have had several different TARDISes throughout his engagements with the Doctor.

During his Earth-based vendetta against the Doctor and UNIT, the Master used a Type 40 Mark II. (DW: Terror of the Autons) Unlike the Doctor's TARDIS, the Master's TARDIS has a fully functioning chameleon circuit.

Exterior
During his early rivalry with the Doctor, the Master changed his TARDIS into several different forms:


 * A Horse Box (DW: Terror of the Autons)
 * A White Door (DW: The Claws of Axos)
 * A spaceship (while he posed as an Adjudicator) (DW: Colony in Space)
 * A computer bank (DW: The Time Monster)

On the planet Gallifrey it assumed the form of a grandfather clock (DW: The Deadly Assassin).

On the planet Traken he used one TARDIS to assume the form of the Melkur. Though this TARDIS got destroyed, he left in another TARDIS, again, in the form of a grandfather clock. (DW: The Keeper of Traken)

While preparing a trap for the Doctor, the Master temporarily changed his ship into a police box, then later an off-white ionic column. (DW: Logopolis) He would then tend to the ionic column as his TARDIS's "default" exterior. (DW:  Castrovalva, Time-Flight, Planet of Fire)

He would, though, configure the TARDIS into the Speedbird Concorde 192 (DW: Time-Flight), and later an iron maiden (DW: The King's Demons) and, within the Matrix, a wooden shack (DW: The Ultimate Foe).

Interior
The Master's TARDIS has had a varied interior, his first TARDIS simply had a scanner (DW: Terror of the Autons), while later interiors seems to mimic the Doctor's re-designs of his own TARDIS. (DW: The Time Monster)

Much of the time it is simply a sombre black version of the interior of the Doctor's TARDIS, sometimes with specialist equipment such as the web (which he used to contain Adric). (DW:  Castrovalva)

Specific Systems
Once, the Master tricked the Doctor into materializing his TARDIS around the Master's, creating a dimensionally recursive loop (DW: Logopolis) - repeating a situation that had previously occurred accidentally. (DW: The Time Monster)