US nuclear missiles still use 8-inch floppy disks. Presumably on some 8-bit micro from the time.

http://www.huffingtonpost.com/2014/05/01/floppy-disk-nuclear...

And of course we're still using operating systems from the 70's - Unix (in Linux form) and VMS (in Windows form).

EDIT: Typo, Corrected 80's to 70's.