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The Sinclair ZX81: Programming for real applications: Hurley, Randle: 9780880560900: Amazon.com: Books
S2 E8 - 40 YEARS since the Sinclair ZX81 (and how it indirectly helped give us the M1) | The Constant Geekery Podcast | Podcasts on Audible | Audible.com
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Not Only 30 Programs for the Sinclair ZX81 (Retro Reproductions): Reproductions, Retro: 9781789825886: Amazon.com: Books
ZX81 - Timex Sinclair 1000 - Home Computer | Simplyeighties.com