The development and evaluation of a potential viewdata-style delivery system for computer assisted learning (CAL) at the Open University are described. First examined are Open University problems with CAL and television delivery systems, which resulted in the consideration of a viewdata approach involving allocation of a small central processor to each user to allow home terminal access to university programs. The Prestel system and its terminal are discussed in terms of their use in CAL. Characteristics and uses of Cyclops, a terminal developed at the Open University, are then outlined, including (1) capabilities for replaying cassette tapes containing picture and sound, and (2) use with light pens to provide an electronic blackboard for terminal-to-terminal communication. Preliminary and planned evaluations of the Cyclops system are summarized. An in-house viewdata system, Optel, which runs on a time-sharing DEC-20 mainframe computer, is then described, and results of a 1980 pilot trial are summarized. Current work which involves evaluation of the Cyclops terminal and Cyclops studio (a microcomputer system which allows a user to create color or black and white pictures in computer-readable form) is also discussed. Four references are listed. (LMM)