Using the StickMount app available on the Play store, which allows users to mount/dismount mass storage devices, he was able to connect the ASUS-made tab to a USB hub and hook it up to a keyboard, mouse and, most amusingly of all, a floppy drive — to play Ultima on DOSbox, of course.
via ULTIMAte hack: Nexus 7 hooks up with external USB storage, floppy drive for retro-gaming — Engadget.