Type 30 page: "why a round tube" section and two photos (the display, and watching Spacewar! on it, CHM). Sortable DEC family / lab-by-lab / instruction tables. Nav dividers in Ports, PDP-1 and Spacewar! menus. Digital Play (Kline et al.) framing across overview/software/ports. Extensive copy edits across the PDP-1 and DEC strands.