Transwarp computer displaying transwarp factor settings

The transwarp computer was the information-storage system aboard the USS Excelsior, responsible for managing the experimental transwarp drive that was installed on that ship in 2285.

In that year, Montgomery Scott sabotaged the transwarp computer, making it impossible for the Excelsior to pursue the Enterprise, which Admiral Kirk and his command crew had stolen. (Star Trek III: The Search for Spock)

An editor's note in the Star Trek Chronology suggests that the line by Data, "There has not been a systems-wide technological failure on a starship in 79 years," in TNG: "Evolution", was a reference to the sabotage of the Excelsior.
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