From the mid-1970s to the early 1980s, schools micro-computing in the UK developed from being a niche "hobbyist" activity to a prominent, officially mandated element of the national education system. Drawing on in-depth interviews with key actors of the time, this paper outlines the initial varied interpretations of schools micro-computing in the UK, identifying the social groups that were involved in pursuing these interpretations, and then considering which meanings and values gained dominance over others. This "social shaping" analysis highlights the processes that underpinned the gradual stabilisation of the meaning(s) around the micro-computer in an educational context. The paper concludes by considering how the eventually dominant interpretations of schools micro-computing can be explained in terms of the technological frames of relevant social groups--not least the differing determinist assumptions of groups hoping to encourage the radical computer-led transformation of schools and schooling, as opposed to those seeking the continuation of established interests.