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New Calc Friday! HP 28C, the first calculator capable of symbolic operations. : r/calculators

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Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History

Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History

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Broken HP 28S battery cover repaired with brass sheet

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HP 28S LiPo Battery | Hackaday.io

HP 28S LiPo Battery | Hackaday.io

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Hacker In Harrison 🐗 on Twitter: "I've got an old Hewlett-Packard HP-28S that needs a battery cover. I've replaced the calculator with a HP-35S but I'd like to get this old one