sentences:  High quality text and graphics output on both paper and film was provided by a Stromberg-Carlson SC4020 microfilm recorder that provided a unique service for many years, especially to people interested in doing computer animation.Associated with the SC4020 was a PDP15 satellite computer that provided previewing facilities for the SC4020 and a range of interactive graphics facilities for users.From 1971, an ICL 1906A was installed with twice the computing power of the Atlas 1.