Martianoids (UK) (1987) - Amstrad CPC - Shooter, Sci-Fi.

The Markons have built a gigantic computer, the Brain of Markon, which has been sent out on a spaceship, on a mission lasting a thousand years to search for new lifeforms. However, the computer is under constant attack from Martianoids. You are the maintenance robot who must activate all nine sectors of the computer and repair it by picking up cones and using them.