
1) Amstrad CPC game 2) ZX Spectrum game
Found on
https://www.crosswordclues.com/clue/marsport

Marsport is a science fiction computer game that was released for the ZX Spectrum and Amstrad CPC home computers in 1985. It was published by Gargoyle Games in the United Kingdom and Dro Soft in Spain. Marsport was intended to be the first part of a trilogy called `The Siege of Earth` but parts two and three (Fornax and Gath) were not forthcomin.....
Found on
http://en.wikipedia.org/wiki/Marsport
No exact match found.