In the 1960s, Hewlett-Packard was becoming a diversified electronics company with product lines in electronic test equipment, scientific instrumentation, and medical electronics, and was just beginning its entry into computers. Those are specialized cases, however. At the current rate of rainfall, when will your local reservoir overflow its banks? Improved version of the HP-35 with 10 memory registers, extra functions and display format selection. It was succeeded in 1976 with the pinnacle of early calculator power: the HP-67, which had 224 program steps, better code editing and debugging, nested subroutines, better comparisons and branching, more memories, and indirect addressing (i.e., branch to the step number stored in a register). Their desktop models included the HP 9800 series, while their handheld models started with the HP-35. This calculator provided functionality that was revolutionary for a pocket calculator at that time. Old calculators are fun collectibles for nerds. Programmable graphic calculators, initially the SX and a year later the cheaper S, and three years later the G and GX with a faster processor and more graphical interface; SX and GX versions had expansion slots. My collection of HP calculators began with the first model that I purchased, brand new, at my university book store. HP's first pocket calculator, and the world's first pocket calculator with transcendental functions. Smaller programmable model with programs up to 49 steps. Easy. The programs also let you do limited if-then branching—that is, if the result of this calculation is less than 0, jump to a labeled line to continue. It was crazy, especially for a device that had a few minor math bugs in its first shipping batch (HP gave everyone a free replacement). There are also sections on calculating machines and slide rules as well as sections for buying and selling HP calculators, an HP timeline, collecting information and a software library. Alan scores! With the HP-65, you could record your programs on small magnetic cards and store them for later. Introduced to commemorate the 35th anniversary of the HP-35, it is an advanced scientific programmable calculator, featuring algebraic and RPN modes, hyperbolics, statistics, numerical integration, numerical solver, random number generation, equations, and full programmability, using up to 32 Kb of RAM for programs and data. and simple unit conversations, such as liters to gallons, and decimal degrees to degrees/minutes/seconds. Financial Calculators Accuracy and durability through bull and bear markets Learn More. At the current rate of rainfall, when will your local reservoir overflow its banks? All of these were rendered totally obsolete in 1979 by a revolutionary new platform: the HP-41C. HP made similar-looking slide-rule and financial printing calculators. Uses the Saturn chip set. Ancient times - The abacus is the main aid to calculation. A basic scientific calculator, using infix notation, barely programmable and with no graphing capabilities. Just make sure it works. Their focus has been on high-end scientific, engineering and complex financial uses. The calculator performed exponents (uniquely in HP calculators, performed as xy instead of yx), roots, logarithms, roots, sine, cosine, tangent—plus the invest arcsine, arccosine, and arctangent. The HP-67 was paired with the simultaneously released HP-97, which did everything the HP-67 did but with a built-in printer. Powered by ARM processor. If you shoot a rocket at an angle of 60 degrees into a headwind, how far will it fly with 40 pounds of propellant and a 5-pound payload? Historically one of the most popular models among engineers.