I remember the excitement of being able to finally make my own .exe files with QuickBasic. It was like earning a new merit badge. First .bat, then .exe, then later using PC Magazine's "DOS Power Tools" book I started to write what I recall were .com files using assembly that was entered into some crude edit software that shipped with DOS. I kind of wish I would have gone deeper with that; instead I tried to dive into Linux and spent years trying to get just daily-user comfortable. :-)