The National Museum of Computing (TNMOC), located at Bletchley Park, is an independent charity housing the largest collection of functional historic computers in Europe, including a rebuilt Colossus, the world's first electronic computer used for code breaking.

TNMOC enables visitors to follow the development of computing from the ultra-secret pioneering efforts of the 1940s through the mainframes of the 1960s and 1970s, and the rise of personal computing in the 1980s. New working exhibits are regularly unveiled and the public can already view a rebuilt and fully operational Colossus, the Harwell Dekatron / WITCH - the world's oldest working digital computer, an ICL 2966 - one of the workhorse mainframes computers of the 1980s - and many of the earliest desktops of the 1980s and 1990s.

In June 2010 TNMOC hosted Britain's first-ever Vintage Computer Festival.

The exhibition, NPL Technology of the Internet, traces the history of communication technologies from the telegraph to today's high speed internet, and explains, the underlying technology of modern data communications.

This History of Computing resource has been made possible through the partnership and generous support of the staff of TNMOC, working together with LGfL and E2bN.

Mission Statement of The National Museum of Computing

"To collect and restore computer systems particularly those developed in Britain and to enable people to explore that collection for inspiration, learning and enjoyment."

The National Museum of Computing is a separate organisation to the Bletchley Park Trust, and anyone can visit TNMOC, when it is open, for a modest charge (If you are going to TNMOC only, the Bletchley Park Trust entrance fee need not be paid.) For opening times, see www.tnmoc.org, For further information about the TNMOC learning programme:www.tnmoc.org/learn