Trek-80 is a text-based video game written by Steve Dompier in 1976 and sold by Processor Technology for their Sol-20 computer and suitable S-100 bus machines.
In contrast to the originals, which were designed to run on teletypes, Trek-80 used the VDM-1 video card to produce a character-based real-time display.
The game took place in a section of the galaxy divided into "quadrants", each of which held a particular number of stars, enemy ships and starbases where the player could repair and refuel.
On arrival, they would use the SRS (short range scan) to display the sectors in the quadrant and begin moving and firing at any targets.
Likewise, when one fired a torpedo, the other ships continued to move while it flew, and it could be detonated early by the player pressing ESC.
[3] Invasion Force differs only in minor ways from the original; the player is in command of the USS Hephaestus and battles the "Jovians", but the game is otherwise similar.
[4] Dompier was familiar with Trek73, and had purchased a teleprinter so he could play a copy running on the DECISION computer at the Lawrence Hall of Science from home.