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Sinclair ZX81: 30 years old • The Register
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Better programming for your spectrum and zx81 by S. Robert Speel | Goodreads
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The Sinclair ZX81: Programming for real applications: Hurley, Randle: 9780880560900: Amazon.com: Books
Not Only 30 Programs for the Sinclair ZX81 (Retro Reproductions): Retro Reproductions: 9798848307481: 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
Sinclair ZX81 Programming for Real Applications: Randle Hurley: 9780333329733: Amazon.com: Books
Sinclair ZX81: 30 years old • The Register
Timex Sinclair 1000 (Sinclair ZX 81) - by Paul Lefebvre
