UK Science Museum Exhibition features PDP-1?

Does anyone know if this is a real working PDP-1 or a mocked up, emulated thingy? Might be interesting for the games nostalgia for those (like me) whose classic computing interest overlaps to classic gaming. http://www.sciencemuseum.org.uk/exhibitions/gameon/ Precis below: *21 October 2006 - 25 February 2007* Explore the history, technology and culture of computer games in this new special exhibition. From the *PDP-1* of the 1960s to the latest consoles, *Game On* examines the technologies that have revolutionised the gaming world. See the ten most influential consoles of all time, learn about the design process behind games such as *Tomb Raider*, investigate the relationship between films and gaming and play over 100 games including classics *Space Invaders* and *Super Mario Brothers*! -- Pete Edwards "Prediction is very difficult, especially if it's about the future" - Niels Bohr