Photo: Getty ImagesIn 1976, Steve Wozniak sold his HP-65 programmable calculator for $500 to start a computer company with Steve Jobs. It wasn’t a huge sacrifice. As a calculator engineer at Hewlett-Packard, he knew that the HP-67 was on its way and, with his employee discount, he could buy one for $370. His more highly prized gadget was the HP-35—the world’s premier scientific calculator and his inspiration for going to work at HP in the first place.

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Persons: Steve Wozniak, Steve Jobs Organizations: HP, Hewlett, Packard