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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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Reviving a Sinclair ZX81 Program from a Decades-Old Magnetic Tape: A Python Adventure | by Tony Gillett | Medium
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Timex Sinclair 1000 (Sinclair ZX 81) - by Paul Lefebvre
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The Sinclair ZX81: Programming for real applications: Hurley, Randle: 9780880560900: Amazon.com: Books
Better programming for your spectrum and zx81 by S. Robert Speel | Goodreads
The Complete Sinclair ZX81 Basic Course (Retro Reproductions): Beam Software: 9781789824353: Amazon.com: Books
Sinclair ZX-81 computer
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Just picked up a Timex Sinclair 1000 and need help with finding power supply. : r/vintagecomputing
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