HP made the HP-9800 in 1968, its first-ever desktop calculator; which was programmable and had computer features, it had to be named so because of the competition existing at that time with IBM. Later, HP, after seeing a gap in the industry, created the HP-35, the first-ever pocket-sized calculator.
Evolution of HP Calculators
Before HP-35, most calculator models used the slide rule, the HP-35 was created as an upgrade to the slide rule and could perform basic arithmetic, trigonometry, logarithms, and linear equations functions. HP developed three models before 1975, but it was the fifth model; HP-65 that was much different from the HP-35. The HP-65 had a memory card slot and was programmable. Users could save their programs in the cards.
With the growing need for better functional capabilities, HP tried and tested several versions of calculators, before finally inventing the HP-10C and the HP-11C, which had better programmable capacity and improvement in trigonometrical functions, i.e., hyperbolic functions. Other vital features for the model were the probability, fractional and statistical functions.
In 1979, HP went a step further and introduced a calculator that could connect to a printer; it also could display alphabets and numbers. The HP-41C was an affordable version of a computer. The model was programmable, and its memory expandable.
In 1986, HP launched its first RPL calculator; HP-81C, the calculator could process algebraic expressions and formula first. The model was however quickly replaced with the HP-19bli and the HP-19b. The model also had over 450 statistical and scientific functions. The model also had a graphics display for histograms and scatter diagrams.
From 1995, technology redefined making of calculators. The HP-48g plus had specifications such as object-oriented programming for easy creation of applications and could connect to the internet via the fast-x-modem connectivity kit.
Latest calculator models like the HP Graphics prime have far sophisticated features with faster connectivity kits and more significant memories for storage of data. But is the data secure? To protect your data and programs, you can use a VPN to hide your online IP address. But, does VPN hide mac address if your IP is secure? Not really, blocking it will prevent connection to the internet. Better ways of barring the mac address hacking are mac spoofing and disconnection of Wi-Fi.
The future of calculators looks deem, with the advent of better applications and apps downloadable to smart-phones, calculators use is expected to decline.