![]() 75 KB usable RAM, a beeper, a callable real-time clock as well as an infrared port for HP 82240A/ HP 82240B printer support and a USB interface (with Micro-B connector) emulating a FAT16-formatted USB mass storage device for easy program transfer and state backup / transfer as well as for firmware updates. ![]() Even though slightly smaller (144×77×13 mm, 170 g) than the original HP-42S (148×80×15 mm, 170 g), the calculator comes with an additional top row of keys for soft menus, a keyboard layout supporting direct alpha character input, a much larger high-contrast display ( Sharp low power transflective memory LCD with a resolution of 400×240, protected by Gorilla Glass) showing all four stack levels at once (configurable), ca. The final product was released on the 9 December 2017. In May 2017, SwissMicros released pre-production samples of an RPN calculator closely resembling the HP-42S, the DM42. ![]() Returns control (and result in X) to either the user or to a calling program. Recall stack register Y and multiply with Xĭecrement stack register Y and if not zero. No memory registers are used.ġ is put into X, hence the value to be calculated upon (which was initially in X) is lifted (pushed) into stack register Y This is a sample program which computes the factorial of an input integer number (ignoring the calculator's built-in factorial function). ![]() The HP-42S supports indirect addressing with which it is possible to implement a Universal Turing machine and therefore the programming model of the HP-42S can be considered Turing-complete. The HP-42S uses a superset of the HP-41CX FOCAL language. The HP-42S is keystroke-programmable, meaning that it can remember and later execute sequences of keystrokes to solve particular problems of interest to the user.
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