The Nintendo M82 was a demonstration unit for the Nintendo Entertainment System to allow customers to try games in-store before purchasing them. The full title on the machine was the M82 Game Selectable Working Product Display. The machine was different from the more arcade orientated PlayChoice.
The M82 could hold 12 games, with the games selectable by the user by pressing a button next to the desired game on the front of the unit. The play time on the unit could be set by the store; this could be 30 seconds, 3 minutes, 6 minutes or 128 minutes.
Nintendo also developed other in-store demonstration units, however the M82 seems to be the common variety of these Nintendo systems.