GO-21 SciRPN!

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. Requires iOS 8.0 or later RPN Copy / Paste Shake to clear X Swipe gestures that roll and display the stack Addition, subtraction, multiplication, division Trigonometric functions : sin, cos, tan, sin, cos, tan, degrees or radians Rectangular/polar coordinate conversion Logarithmic functions : log, 10x, ln, ex Other functions : Yx,1/x, x, Display : LED, 10 significant digits (8 + 2 digit exponent in scientific notation), 10-99 to 10+99 Memory : 4 register stack, stack roll down, X-Y interchange, manual memory with register math floating stack and memory window