The HP-21 was a basic scientific calculator from the late 1970s. It was basic, but well thought out and well made. It was a delight to use.
Features
The calculator had:
– Trigonometric functions (SIN, COS, TAN) and their inverses
– Worked in degrees or radians
– e^x, natural logs, 10^x and Log10
– Normal (fixed decimal point) notation and scientific notation
– A memory
– Storage register arithmetic
The hp21w also comes with:
– A microcode debugger so you can see how it works
– No need to use the debugger if you just want to use the calculator
Downloading & Installing
You can download a copy by clicking the button below. It is a ZIP file so the process is:
– download it
– unZIP it anywhere you want
– double-click “run.bat”
Buying a copy
The download will run for 10 years without you needing to pay for it. If you install it on a new standalone computer sometime in that 10 years, or on a new company network in the same period; it will run for another 10 years. You can do that as many times as you need to.
If you would like to buy a copy, or contribute some money as a thank you, it would be appreciated. You don’t have to. Doing so is entirely up to you. If you do want to, there’s a link below. If you’d like to contribute more, feel free to buy more than one copy.
More Information
If you wan’t to know more about the emulator, start with using the windows calculators and The new calculator debuggers (if that part interests you).
Of course, you can also just download it and try it.
