Another Rob "Retro" Marshall posting i'm afraid 
Well worth taking a peek at this link, worlds first graphical game for a 16-bit computer from the Adams family (Richard, Eric, Scott!) ...
Today many computer enthusiasts write programs at home for their own graphical games. It's fun. This page documents the first graphical computer game written at home on capable home computer hardware. It turns out that both the game software and the computer hardware were created at home by three brothers all in college in the mid '70s.
What a contrast to todays high-powered 3D computer games eh! I was about 4 years old when this was happening ...
Read the complete post at http://wmug.co.uk/blogs/r0b/archive/2009/05/05/first-graphics-game-written-on-and-for-a-home-computer.aspx