The Powertran Cortex was a 16 Bit Home/Business Computer that appeared as a construction project in Electronics Today International (ETI) magazine. It was spread over three articles spanning November 1982 through January 1983.
It started out life as a design created by a few talented engineers who were working at Texas Instruments UK. Having created this masterpiece, they found themselves conflicting with TI's Business and Home Computer divisions, so were unable to make it a commercial success. The solution was to have it published in ETI and have kits (and fully built units) available from Powertran Cybernetics.
This website tries to preserve all known resources for the Cortex and there's lots to explore: