A computer module was a type of device.
In 2154, Vulcan Ambassador Soval possessed a computer module that showed its user gaps in Vulcan satellite surveillance, when beam-ins to the planet's surface couldn't be detected. Without permission, Soval gave the computer module to Starfleet Commander Charles Tucker III, in an effort to help Captain Jonathan Archer and Commander T'Pol transport to Vulcan. While feigning ignorance of the device's significance, though, Soval referred to the device as a "Starfleet data module." (ENT: "The Forge")
The term "computer module" comes from the script of "The Forge".