Since I'm old I'm kind of in to old things. I recently obtained an "IBM PC" with a 5 ¼” floppy drive and a 10 Meg HD (Upgraded from two 5 ¼”) for $2.

It works and is loaded with old Disney games and the like. It even has a nice user friendly (for the day) menu to select programs.

3.3 DOS. That's when an operating system was an operating system. You had to walk 10 miles through the snow....... etc