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When Hewlett-Packard introduced the HP-71B in 1984, it was a major departure from the company's previous RPN (Reverse Polish Notation) keystroke-programmable calculators. With a full QWERTY keyboard and alphanumeric display, the 71B was programmed in BASIC, and incorporated an exceptionally powerful algebraic calculator. An enormous amount of effort also went into the 71's ground-breaking implementation of IEEE 754 floating point arithmetic. Using HP-IL to connect to external drives, printers and other peripherals, the 71 was ideal for small and portable data acquisition setups. Even without HP-IL, the 71 was a versatile tool for technical professionals who didn't want to lug around one of that era's "portable" computers, with a long battery life and the ability to save and reload program and data files via the optional card reader. Even today, the 71 stacks up well against contemporary graphing calculators; its BASIC language is easy to use, the optional Math ROM gives it support for hyperbolics, complex numbers, matrices, root finding, numerical integration and fast Fourier transforms, and a community of enthusiasts continues to produce memory upgrades and PC connection devices. I still use my two on an almost-daily basis, despite having many other calculators in my desk drawer, and it's my go-to machine for quick solutions to tricky problems.Read full review
Verified purchase: Yes
This vintage calculator provides the capabilities of a minicomputer with its Basic programming feature, as well as the ease and flexibility of a hand held calculator , when that mode is selected. For its age, the device is in pristine shape.
Verified purchase: Yes | Condition: Pre-owned
Great vintage calculator. Still works great after all these years. Emulators are available but having the real keyboard is much nicer. Lots of free software on web. PIL-Box recommended.
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Very well packed. All working. Marks are less than depicted -> all good
Verified purchase: Yes | Condition: Pre-owned
Good calculator, buzzer don't work
Verified purchase: Yes