The following images of the S-1 Mark I came from "The S-1 Project at LLL: A Tide in Computational Physics," January 24, 1978 (Courtesy LLNL).
12 boards, arranged in three "pages" with fans at top to pull air over the chips within a page; power supplies are in the base of the cabinet
Many thanks to Maxine Trost, LLNL archivist, for her help in obtaining these photos.
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