App: GO-21 SciRPN
Developer: Stephen Lidie
Genres: Utilities, Productivity

GO-21 SciRPN simulates the venerable HP-21 Pocket Scientific Calculator from 1975.  Virtually indistinguishable from the real item in operation, GO-21 is a powerful yet simple retro calculator. 

• RPN (Reverse Polish Notation)
• 10-digit LED calculator display, 10-99 to 10+99
• Four stack registers with roll down
• One storage register with arithmetic memory operators
• Math, trigonometric, polar/rectangular, logarithmic, power and other miscellaneous functions
• One additional window with views of:
	◦ stack/storage registers
	◦ keystroke log
• Copy-from and Paste-to the calculator display
• Simple Paper Tape annotations

Release notes:
- Support iPhone 14; cosmetic improvements for iPhones 5, 6, 7 and 8.
- Update for iOS 16, macOS 12.6, tvOS 16.