I found the book wich started my interest in coding. This book contains a small QBasic script which at the time I just tried on my computer and it worked. Text on the cover is German and means: The computer thief.
@holgerfrohloff, no, if I remember it correctly, the main protagonist. He sees a computer he can't buy and decides to steal it. But I can't remember the end anymore. It has been a long time since I read it. Regarding pixel art, I think this book predates computers with images :-) So, I'm not sure whether the concept of pixel art was already known then.