Their digital circuitry incorporated several smart tricks, including a method to make the battery last longer. In a way, their sophisticated, compact design foreshadowed the Apple products to come. Wozniak and Jobs didn’t just build one blue box-they went on to build dozens of them, which they sold for about $170 apiece. Wozniak had a better, geekier idea: They needed to build their own blue boxes, but make them with digital circuits, which were more precise and easier to control than the usual analog ones. That same day, as Lapsley details in the book, Wozniak and Jobs bought analog tone generator kits, but were soon frustrated that the generators weren’t good enough for really high-quality phone phreaking. The friends drove to the technical library at Stanford’s Linear Accelerator Center to find a phone manual that listed tone frequencies. Wozniak immediately called Jobs, who was then a 17-year-old senior in high school.
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