The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [1] (equivalent to $5,069 in 2024) [2], it featured nine …

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The HP-65 was the first HP pocket calculator with base conversions (but only octal and decimal). It was also the first to directly perform degrees.minutes seconds arithmetic (D.MS+ and D.MS-).