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Not Only 30 Programs for the Sinclair ZX81 (Retro Reproductions): Reproductions, Retro: 9781789825886: Amazon.com: Books
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Timex Ts1000 Computer/Sinclair Zx-81 Computer (Sams Computerfacts): 9780672089695: Amazon.com: Books
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The Sinclair ZX81: Programming for real applications: Hurley, Randle: 9780880560900: Amazon.com: Books
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The 40-Year-Old Version: ZX81's sleek plastic case shows no sign of middle-aged spread • The Register
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Celebrate the 40th anniversary of the Sinclair ZX81 with this multifunction-key-tastic T-shirt | smittytone messes with micros
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My latest non-Commodore eBay pick-up: Sinclair ZX81 computer with 16k Ram Pack. Sadly no PSU included. : r/retrocomputing
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The Complete Sinclair ZX81 Basic Course (Retro Reproductions): Beam Software: 9781789824353: Amazon.com: Books
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