Powerful, customizable 32-bit RPN calculator for Windows with 300 functions (scientific, business, conversion, computer science, physics, complex numbers, geometry, vectors, etc), full 4 or 8-level stack, international support for different comma and decimal point formats, programmable, macros, registers, custom button banks, etc. In the first three years after its introduction in 1972, sales of the HP-35 Scientific Calculator exceeded 300,000 units. Download Options: Hewlett-Packard Calculator Training Page - emulator download site. Display: Textbook Format Display (TFD), 31 x 96 pixel LCD display. Fits in a shirt pocket and does everything its larger predecessors did. On this page you will find useful materials for the operation and use of the HP Prime.