A wrist computron is a portable device carried by Troy and Dillon during their first adventures on the newly-discovered Earth.
The complete features of the wrist computron are not defined. One feature, personal invisibility, is used by Willy to torment a bully, Tucker (Galactica Discovers Earth).
Galactica 1980 definition: wrist computer, a device with a multitude of different capabilities (1980: "Galactica Discovers Earth, Part I")