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DuB-EnG: Vintage Retro Commodore Calculator Restoration - PR-100 LED display - Battery Corrosion - YouTube
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File:Vintage Commodore Pocket LED Calculator, Model SR-1800, Made in Japan, Circa 1976 (9263178963).jpg - Wikimedia Commons
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Commodore C108 desktop calculator using Omron Alpha chip set. Here displaying 10^8 overflow condition using a red LED behind a panel. : r/calculators
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