orpie binary package in Ubuntu Bionic i386

 Orpie is a fullscreen RPN calculator for the console. Its operation is
 similar to that of modern HP calculators, but data entry has been optimized
 for efficiency on a PC keyboard. Features include:
 .
   * real and complex numbers and matrices
   * extensive function library
   * command completion of function names
   * base conversions
   * units and conversion factor handling
   * exact integer arithmetic, with unlimited integer size
   * visible stack, with browsing/modification capability
   * user-defined variables
   * user-configurable keybindings, via a Mutt-like rcfile
   * context-sensitive help

Source package