Going back in time, the calculator you choose speaks to a large extent about your abilities, and nothing can explain the problem better than the legendary HP Voyager series of programmable calculators. From the horizontal layout to the mysterious keycaps to the reverse Polish notation, everything about these calculators expresses a serious purpose.
Sadly, these calculators are now hard to buy at any price.So if you desire their unique look and feel, your best choice might be like [alxgarza] with Build your own Voyager series simulator. This particular build simulates HP15C and runs on ATMega328. Purists may object to the 192×64 LCD matrix display instead of the original ten-digit seven-segment display, but we don’t mind the update at all. The size of the PCB where the emulator is located is just right, and the keyboard is composed of discrete switches, which is as satisfactory as the original. We also appreciate using only through-hole components-it looks very retro. The video below shows that the calculator can be used perfectly without a case; however, a 3D printed case can be used, as well as a copy of the original keyboard overlay.
We have seen simulators of other classic calculators, including Sinclair, Texas Instruments, and even other HP product lines. But this one has a very good design, let’s move on.