I got QuickBasic recently, and the idea to make a crackme, a simple thing:
But i've absolutely no idea about how to unpack/crack this 20 year old stuff.
if you guys want try, you can find a compiled version here http://pcloud.crdf.net/xylitolpublic/crackme_qbasic.zip
Work on windows XP, not sure for vista/7
Edit 22 Jan 2012: Gotcha!1