Universal emulator

A Universal emulator was a part of a Transformers anatomy which some members of the race were equipped with. In the only known example, it was located behind the insignia of the Transformer in question.

A universal emulator was remarkably adaptable, allowing it to be placed within a robot which would function as a body for the Transformer that the device was removed from. This piece of Transformer anatomy was capable of acting in place of another technogizmo known as an Isolator key.

Fiction

Generation 1 cartoon

Perceptor was equipped with a universal emulator. Upon entry into Quadrant X, he was damaged to the point that he was trapped in his alternate mode. Crashing to planet Zamojin, Katsu Don, one of the native Zamojins, carved off Perceptor's Autobot symbol, unwittingly taking the universal emulator out with it, to provide a face for the long-inert robot known as Nijika. The emulator promptly interfaced with Nijika's systems, transforming the Autobot symbol into a functional face, and allowing Perceptor to operate the robot.

The Quintessons were also after this piece of Perceptor, seeking to replace the damaged isolator key that operated the Quadrant Lock, a device which kept the planet's populace deprived of its power-giving starlight. The Face of the Nijika

From Teletraan I: The Transformers Wiki, a Wikia wiki.