Chock-A-Block was a BBC children's television programme, first shown in 1981 and repeated through to 1989 and shown as part of the children's programme cycle See-Saw (the "new" name for the cycle originally known as Watch with Mother). "Chock-A-Block" was an extremely large yellow computer, modelled to resemble a mainframe of the time; it filled the entire studio and provided the entire backdrop for the show.
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