RPN-34 CE3.2 - App Store

RPN-34 CE is the first photo-realistic simulation of Hewlett-Packard's popular mid-range scientific calculator HP-34C for the iPhone. Produced from 1979 through 1983, it was the "Basil" member of the third-generation HP calculators known as the "Spice" series.

It was the first pocket-calculator ever capable of doing integration and root finding.

While the simulator works like the original calculator, a number of carefully designed extensions, along with the tremendously improved speed, make it joy to use even today.

RPN-34 CE comes with the programs of HP's "Applications", "Mathematics", "Surveying", "Student Engineering", and "Statistics" application books built-in! Handbooks may be downloaded from CuVee Software's website.
Features:

. Photo-realistic look-and-feel
. Programmable (999 steps), subroutines, 12 labels, 10 flags
. 100 registers, "continuous", with full store/recall arithmetic
. "Live" register view
. Program listing view with intelligent navigation
. Program library, easily backed-up via iTunes
. Store and retrieve any number of programs
. Sharing: e-mail, AirDrop, Dropbox, copy, paste, print
. 62 programs pre-installed (53 original HP)
Calculator functions:

. Integration, root solving
. Statistics (mean, standard deviation, linear regression, normal distribution)
. Factorial of any number (normal and logarithmic)
. Trigonometric and hyperbolic functions (degrees, radians, grads)
. Polar/rectangular conversions
. Inverse, square root, logarithm, exponential, pi
. Storage arithmetic (both store and recall)
. Statistics (average, standard deviation, y-estimate, linear regression)
. Unit and hours conversions
. 31 additional functions not found on the HP-34C, like time and sound

Details: cuveesoft.ch/rpn34

Version History • Improved compatibility with iPhone Air and iOS 26.

Bug Fix:

• Pausing a loop would show the "busy" indicator instead of the current X value. 3.2 12/04/2025 • Improved compatibility with iPhone Air and iOS 26. 3.1 10/15/2025 Non-volatile stack: when reloading the app, the stack is now restored along with all registers. 3.0 07/25/2025 • Faster startup – no delay until the first button press is recognized after switching on. 2.9 05/08/2025 • The setting "Registers" is now part of a saved program.

• Improved compatibility with a real HP-34 when recalling statistics registers

• Visual adjustments for iPhone 16 Pro and iPhone 16 Pro Max 2.8 02/20/2025 • Added warning when attempting to replace a Sample Program.

• Added "GTO + +" (supplementing "GTO . ." and "g END") to address the last step of a program in both RUN and PRGM modes.

• Optimized SOLVE function.

• Added Example 2 to sample program "[A38]-Disc. Cash Flow Analysis". 2.7 10/16/2024 • After computing an integral, the "uncertainty" stack register Y contains the current "Integration Accuracy" setting (0 = Best, 1 = High, 2 = Norm).

• The "Integration Accuracy" setting is now stored along with the program.

• Added "-" following the step number in PRGM mode, as on a real HP-34.

• The display now may show dashes on lengthy calculations.

• Verified and cleaned up descriptions of many sample programs.

• New sample programs added: "Double Integrals" and "Memory Game and Trainer".
• Bug Fixes:

- The previous version 2.5 didn't drop the stack on y^x.
- Suppressed illegal key sequences, like "LBL CHS" or "LBL +" etc.
– "SOLVE lbl" is now correctly listed as "14 73 lbl", not "14 .lbl" (where lbl = 0..9, 11, 12).
- In PRGM mode, two consecutive RTN steps could show up at the end of a program. 2.6 01/15/2024 • Unicode blanks are converted to regular blanks when pasting program text.

• Added sample program "Grazing Goat"

• Runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch)

• RPN-34 CE requires iOS 12.0 or later.

• Bug Fixes:
– Applying the integrate function to very large numbers could cause a crash.
– The "What's New" would reappear even when told not to. 2.5 12/19/2023 Fixed an issue where program lines cut using "g PCut" would not always get pasted correctly. 2.4.1 01/04/2023 • Haptics

Set the haptic feedback level in the calculator's settings.

„Sounds & Haptics“ / „System Haptics“ must be on in the iPhone's settings.

• Improved Indirect Branching

Labels .0 and .1 may now be targets of indirect branching
via the I-register if extended registers 0..99 are enabled.

• Program list view can be dragged down to dismiss it. 2.4 09/28/2022 • Change the program listing font with a simple tap on the new button "F"

• Apply a filter to quickly find any program.

• Sample Programs may be hidden in the list of programs. 2.3 04/09/2022 • Minor improvements
Bug Fix:

• ISG/DSE commands were susceptible to internal rounding effects 2.2 12/15/2020 • Print (or mail as PDF) the program or its description

• Improved accuracy in extreme cases of y^x with positive, integer x.
For example, 1.0000001^(2^27) = 674530.4707, not 674530.4760

• Stack shows localized formatted value while number is being entered

• Call up "What's New" anytime from Info screen

• Compatibility with iPhone 12
Bug Fixes:

• Fixed display issues when using the iPhone in "Zoomed" mode

• The RND function didn't work correctly in regions using a comma as decimal point

• Double- or triple-tapping the empty program listing could cause a crash. 2.1 11/08/2020 • Improved LN(x!) function:
- Higher accuracy
- Now returns y and z such that x! = y * 10^z (where z is an integer)

• If SOLVER is called from a program, and a root is not found, the program doesn't stop anymore. Instead, the next step is skipped. This allows iterative searching for roots under program control.

• Improved stack display (swipe display right to show):

- Doesn't cover top bar functions anymore.
- Shows unformatted values of x and Last x.
- Long-press to directly call up the register view.
- Correct digit entries by swiping left.

• Email programs directly from the program list

• Replacing registers by pasting a program into the display is now optional

• Support for iOS 13: Dark Mode, file sharing
Check out the new Download walk-through on the website (under "Sharing".)
Bug fix:

• Executing the summation command ∑ with a very large argument would cause a crash
RPN-34 CE now requires iOS 11 or later. 2.0 01/25/2020 Fixed an oversight that caused the low-battery warning to come up much too early. Sorry for any inconvenience! 1.3.1 07/03/2019 New features:

• Long-press program listing to change font of description from proportional to non-proportional and vice versa.

• New program "Curve Fit Automatic" added 1.3 07/02/2019 • Register I is now formatted in Register View for easy interpreting in ISG/DSE commands

• New program added: "Locating the Moon" 1.2 04/06/2019 • Optional stack display (swipe display right/left)

• Cut and paste any number of program steps, even between programs!

• Set flags are shown as highlighted register number in Register View

• Flags are now saved and loaded along with programs

• Select integration precision in Settings (Norm/High/Best)

• Added two program pacs ("Student Engineering Applications" and "Surveying Applications")

• Improved reliability of comparisons
Bug fix:

• In rare situations, executing Integrate or Solve from the keyboard would not stop correctly after the calculation 1.1 02/05/2019 1.0 01/09/2019