The HP 65 Programmable Pocket Calculator - HP History
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Programming Handheld Calculators
Hewlett-Packard HP-65 Handheld Electronic Calculator
![](https://www.hewlettpackardhistory.com/wp-content/uploads/2020/02/trial-of-a-century-scaled.jpg)
The HP 65: A 15-Day Trial - Hewlett-Packard History
![](https://www.hpmemoryproject.org/pict/wall_b/hp65_inbox.jpg)
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Calculator Archives - HPCA Archives Virtual Vault
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DATAMATH
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HP-65 - Wikipedia
![](https://www.hewlettpackardhistory.com/wp-content/uploads/2020/03/HPC-OBJ-0412-0001-01-1500x1268.jpeg)
Calculator Archives - HPCA Archives Virtual Vault
![](https://www.hewlettpackardhistory.com/wp-content/uploads/2020/03/HPC-RR1653-0004-0004-scaled.jpg)
The HP 65 Programmable Pocket Calculator - HP History
![](https://thumbs.worthpoint.com/zoom/images2/1/1114/21/hp-65-vintage-scientific-calculator_1_c0528a2f7485cbd524fd26d7e03b8dec.jpg)
HP 65 Vintage Scientific Calculator, RARE, Excellent working condition USA MADE
![](http://www.arithmomuseum.com/a/P216-1.png)
Virtual Museum of Calculators
![](https://2.bp.blogspot.com/-x0iQRch8KV0/XMHssH41biI/AAAAAAAADzY/2fxfhi7hO0kXOn1i_eptg89yCQdox_QGQCLcBGAs/s1600/calculators-history.jpg)
Meet Your Smartphone's Grandparent: Pocket Calculator
![](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/HP-12C_programmable_calculator.jpg/1200px-HP-12C_programmable_calculator.jpg)
HP-12C - Wikipedia
![](http://www.quadibloc.com/comp/images/9100_l5.jpg)
Pocket Calculators and Other Things: Prelude to the Microprocessor
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