People's Computer Company (PCC) publishes Volume 2 Number 3 of its newsletter. In the newsletter is a BASIC program for "Star Trader", by Dave Kaufman. "Star Trader" is a sector-based game with ports and a player moving between sectors trading three basic products (Fuel, Organics and Equipment) to earn credits. It is thought to be one of the precursors of the game Tradewars.

Source

http://www.eisonline.com/twhistory/