HP-65

Model: HP-65
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Year: 1974
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Info: The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 (equivalent to $4,368 in 2021), it featured nine storage registers and room for 100 keystroke instructions. It also included a magnetic card reader/writer to save and load programs. Like all Hewlett-Packard calculators of the era and most since, the HP-65 used Reverse Polish Notation (RPN) and a four-level automatic operand stack. It was the first programmable calculator to be used during a space mission. The calculator was supplied to the astronauts of the Apollo-Soyuz test program, to be used in the event of a malfunction of the Apollo Guidance Computer

 WIkepedia HP-65