Understanding Your ZX81 ROM

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The ZX81, launched in 1981 by Sir Clive Sinclair, revolutionized home computing by offering an affordable entry point for the public. Selling over one and a half million units, it gained popularity not only through official sales but also via numerous unauthorized clones, especially in Eastern Bloc countries. The option to purchase the machine as a kit encouraged a DIY culture, allowing users to assemble it themselves and explore its capabilities. This hands-on approach fostered a community of enthusiasts who shared programs saved on audio cassettes.