Product brochure for Secondbase’s stick-on push-button keyboard overlay for the TS1000/ZX81, designed to solve the flat membrane keyboard’s lack of tactile feedback. Made of silicone rubber with a claimed 3.5-million-keystroke lifespan, heat/cold/moisture resistance, and no soldering or disassembly required for installation — it simply adheres over the existing flat keyboard. Priced at $15.00, with a bundled game-playing overlay and stick-on directional/command labels; additional overlay packs available separately at $1.50.
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