In 1977, two of the hottest personal-electronics categories were calculators and digital watches. HP combined them in the form of the HP-01, the first calculator watch. It was a quartz timepiece with what counted as an oversized LCD display at the time, a low-power microprocessor, and a 28-key keypad you jabbed at with a microscopic stylus which could be stored in the wristband clasp.
HP Gets Back Into Smartwatch Business By Harry Mccracken
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