RPNcalc-----------------------------------------------------------------------> This software is for Newton 2.0 and 2.1 Newtons ONLY. -----------------------------------------------------------------------What is it?RPNcalc is a small, multi-function RPN calculator intended as a replacementfor the built-in Newton calculator app for those who prefer RPN.  It was designedto be small in both program size and heap usage.This program is freeware; if you desire a smaller five-function RPN calculator tryRPNcalc Lite.--What are the functions?RPNcalc is a multi-function calculator with an eight entry stack.  Numbers canbe entered in either normal notation (ie. 4.32) or exponential notation (4.3E+2).At the bottom are two pickers: one selects the display mode for the screen(floating, fixed 2, fixed 4, and engineering mode) and another selects the trigmode (degrees, radians, and gradians).The program has two states: display mode or number editing mode.  While innumber edit mode the bottom line will show on the left side of the display.  Indisplay mode the bottom line will show the zero stack entry on the right side.Pressing numbers while in display mode places you in number editing mode, whichremains until either the 'Enter' key is pressed or a numeric operation key is pressed.The back arrow key removes digits from the number currently being input innumber editing mode, or drops the stack by one if in display mode.The 'Clear' key removes all numbers in the edit buffer while in number editingmode; if in display mode pressing clear will cause a 'Clear?' prompt on the topline.  Pressing 'Clear' again will clear the entire stack, or any other key willcancel the clear mode.There are ten memory registers.  To store the bottom stack entry to a register,press 'Sto' and the memory register, one of the '0'-'9' keys.  To recall a valuefrom a register into the bottom stack entry, press 'Rcl' and the memory registernumber ('0'-'9').The 'Swap' key will swap the bottom two entries in the stack.The 'Undo' key can undo all arithmetic operations (but just the last operationperformed), and some stack functions.  It cannot, however, undo stack rotates(just do the opposite rotation).--Error messagesThe error messages in RPNcalc are pretty basic, and arise from thefloating-point exceptions in the processor on the Newton.  Entering numbers(or calculating results) larger than1E+308 or smaller than 1E-308 willproduce an 'Overflow' message in the top line of the display.'Error' will be displayed in the top line of the display if an incorrect keyis pressed, or the square root key is pressed with a negative number in thestack 0 entry.--Save stateRPNcalc saves the entries in the stack when the program is closed sothey can be used the next time it is run.  Upon deletion of the program theseentries are removed from the system soup.