GO-2+ SciRPN 4+

GO-2+ SciRPN bundles the Apps GO-21, GO-25 and GO-29, simulators for three vintage HP scientific calculators: the HP-21, HP-25C and HP-29C. Manufactured from 1975 through 1979, these calculators were part of the beloved Woodstock series, and the Apps faithfully reproduce their appearance and behavior.

GO-21, GO-25 and GO-29 are universal purchase Apps that run on iPod, iPhone, iPad and Macintosh. Additionally, GO-21 runs on Apple TV.

While GO-21 is simply a calculator, GO-25 and GO-25 are also programmable. GO-21 features (shared by GO-25 and GO-29) include:
• Requires iOS 9.0 or later
• RPN (Reverse Polish Notation)
• Copy / Paste
• Shake to clear X
• Double-tap gesture that displays the stack
• For iPad two finger drag operations for displayed views
• Addition, subtraction, multiplication, division
• Trigonometric functions : sin, cos, tan, sin⁻¹, cos⁻¹, tan⁻¹, degrees or radians
• Rectangular/polar coordinate conversion
• Logarithmic functions : log, 10**x, ln, e**x
• Other functions : y**x,1/x, √x, π
• Display : LED, 10 significant digits (8 + 2 digit exponent in scientific notation), 10-99 to 10+99
• Fixed, scientific and engineering display notation with variable number of significant digits
• Memory : 4 register stack, stack roll down, X-Y interchange
• 1 manual memory register with register math
• Simple Paper Tape annotations
• Detailed in-App documentation

GO-25 adds:
• Programmable with 99 program steps, conditionals
• 4 additional key codes DMP, BEL, SEC and RND
• Fast, slow or single step execution
• Built-in library of Sample Programs
• Program import via pasteboard of other Apps
• Program export via printer, email, pasteboard or other Apps
• Program documentation in plain Text and rich HTML
• iTunes File Sharing
• iCloud program storage
• Double-tap gesture that displays the program listing
• Trig functions in degrees, radians or grads
• Hours (or Degrees), Minutes, Seconds / Decimal Conversions
• Summation Σ+, mean, standard deviation
• FRAC, INT, ABS, %
• 10 manual memory registers with register math

GO-29 adds:
• Programmable with 198 program steps, conditionals
• Subroutines, labels, branching, indirect addressing
• Rapid reverse branching
• Program documentation in plain Text and rich HTML
• 30 manual memory registers with register math
• 10 primary registers
• 6 statistical registers
• 14 indirect registers