Hewlett Packard - HP 35


Brand: Hewlett Packard
Model: HP 35
Type: Scientific calculator
Batteries: Battery pack
Lifetime: Introduced: 1972
Terminated: 1978
Notes: Hewlett Packard's first pocket calculator.

Very powerful for its time, uses RPN and includes useful scientific functions such as trigonometric functions and their inverses (using the "arc"-key), logarithms and powers (using the "x^y"-key).

This calculator doesn't have the complex look the other HP's have, simply because there are only three keys with double functions :-)

As usual with the early HP calculators, this calculator as a very strong case and keys that simply won't wear out.

Triumph 81S Battery Pack Something strange is going on with the second HP 35 in my collection, the one shown on the right. When I found that one on a flea market I first thought I had found an HP 80, on closer inspection however it turned out to be a HP 35 with a "Hewlett • Packard 80" designation on the front. According to other sources on the net, such as the excellent site The Museum of HP Calculators (link valid 2006-10-29), the designation should have been "Hewlett • Packard" or "Hewlett • Packard 35" (like the one on the left).
Also, the one on the left has all its markings on the keys themselves whilst the one marked 80 has them above the keys. If anyone can explain this trange fact, please send me a mail.
Very strange.

There's some information on the HP 35 on HP's official website: http://www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0023/index.html (link valid 2006-10-29).

For more information on this beauty please refer to the better sources, like The Museum of HP Calculators (link valid 2006-10-29).

Picture: HP 35 picture HP 35 picture


A power adapter.

©2009 Ernst Mulder