Cygnus 8

Cygnus 8 is an updated version of the C64 game Star Trader (released in 1984 by Bug-Byte Software). It's essentially a space trading game where the goal is to become rich and famous by buying and selling a variety of commodities, but it's different from most games in the genre in that your main character has a life outside his spaceship as well. He needs food and sleep, and he can do various things while visiting any of the planets in the game.