Some computer museums are a part of larger institutions. For example, the Science Museum in London and the Deutsches Museum in Munich. Others, such as the Computer History Museum in Mountain View, California, the MuseumsForum in Paderborn, and The National Museum of Computing at Bletchley Park, deal only with computing. Some deal mainly in the early history of computing. Others focus in the era that started with the first personal computers such as the Apple I, Altair 8800, Apple IIs, older Apple Macintoshes, Commodore Internationals, Amigas, IBM PCs and more rare computers such as the Osborne 1. Some deal more on research and conservation. Some museums are for computer education and entertainment. There are also private collections.