Thursday, November 20, 2008


The HP-65 was the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974, it featured nine storage registers and room for 100 keystroke instructions. It also included a magnetic card reader/writer. 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.

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