Long-lost, earliest MS-DOS precursor was discovered in a floppy disk collection?

I really suck in software, and always have. However, even I thought this interesting. [www.msn.com] I still remember 12" floppy disks for loading industrial CRT test machines for Toshiba in the late 1980's. I still have 5.25" floppy disks, but nothing to run those on. I do still have 3" diskettes and several DOS and WIN 3.1 softwares. How many pirate, and other station, loggings do you still have on MS-DOS?