Actually, come to think of it I did write one game that my dad played a lot. It was a simple "city simulator", where you purchased land, bought and sold wheat, and assigned peasants a number of acres to farm. I think I called it Kingdom of Wheat. Peasants would immigrate into the kingdom if things were really good, some would leave if things got bad, have children, etc. Natural disasters, raiders, and miscelleaneous crap would tear stuff up, and if you ever really screwed things up, the peasants would storm the castle and execute you in various gruesome ways. Unfortunately, when I found the old machine years later, all the drives had crapped out, floppy drive was really bad, used connections nobody supported anymore, and I had lost the source. Dad's asked me if I could re-make it for him, but for the life of me I can't remember all the formulas I'd made for it to work so well.
Heh, back in those days I could have printed the whole thing to paper and it probably wouldn't have been 20 pages long.