RPN-32 CE4.3 - App Store

RPN-32 CE is the first photo-realistic simulation of Hewlett-Packard's popular mid-range scientific calculator HP-32E for the iPhone. Produced from 1978 through 1983, it was the "Thyme" member of the third-generation HP calculators known as the "Spice" series.

While the simulator works like the original calculator, a number of carefully designed extensions make it a lot easier to use.

Unlike the HP-32E, this version is fully programmable, running virtually all programs written for the HP-25!
Features:

. Photo-realistic look-and-feel
. Programmable (99 steps), subroutines, flags, loop control, branching
. Insert and delete steps with automatic address correction
. 20 registers, "continuous", with unrestricted store/recall arithmetic
. Indirect register addressing
. "Live" register view
. Program listing view
. Program library view
. Store and retrieve any number of programs
. Sharing: e-mail, AirDrop, Dropbox, copy, paste, print
. 44 programs pre-installed
. Import GO-25 programs
. Export programs to RPN-25 CE

Calculator functions:

. Statistics (mean, standard deviation, linear regression, normal distribution)
. Factorial
. Trigonometric functions (degrees, radians, grads)
. Polar/rectangular conversions
. Hyperbolics
. Inverse, square root, logarithm, exponential, pi
. Storage arithmetic (store and recall)
. Percent change
. Percentage of Total
. Unit and hours conversions
. Many additional functions not found on the HP-32

Details: cuveesoft.ch/rpn32

Version History • Improved compatibility with iPhone Air and iOS 26. 4.3 10/15/2025 Non-volatile stack: when reloading the app, the stack is now restored along with all registers. 4.2 07/25/2025 • Faster startup – no delay until the first button press is recognized after switching on. 4.1 05/08/2025 • Added warning when attempting to replace a Sample Program.

• Increased pause length to 2 seconds

• Visual adjustments to iPhone 16 Pro and iPhone 16 Pro Max 4.0 10/22/2024 • Clarified program example on info screen by adding an instruction.

• Internal optimizations and cleanups.

• Modified info screen to avoid clipping by the Dynamic Island. 3.9 01/15/2024 • Runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch)

• RPN-32 CE requires iOS 12.0 or later 3.8 12/23/2023 • Haptics

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

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

• Program list view can be dragged down to dismiss it. 3.7 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. 3.6 04/09/2022 • New sample program "TVM - Time Value of Money"
Run financial calculations involving payments, interest rate, present and future values, and periods or number of payments. 3.5 10/05/2021 • When executed interactively, ISG and DSE do not change the program counter
Bug fixes:

• Deleting a block of program steps could result in wrongly adjusted branch targets in some cases

• ISG/DSE commands were susceptible to internal rounding effects

• RCi did not lift the stack when executed by a program 3.4 12/15/2020 • Print (or mail as PDF) the program or its description

• A program running longer than one minute will emit a short beep when executing the final GTO 00 command

• Tap f or g, then P/R to see a 12- or 24-hour clock.

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

• 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.

• Setting the haptic feedback level didn't check sufficiently for the correct code 3.3 11/08/2020 • Some programs have been added or updated. Be sure to execute "Reload Sample Programs" to refresh the list.

Bug fix:

• Instructions involving register arithmetic with extended registers were not correctly encoded 3.2.1 09/24/2020 • NOP instructions targeted by GTO or GSB are automatically changed into LBL instructions

• Operations and decimal point following STO or RCL may now be added or removed in any order

• New instructions: exchange X directly or indirectly with any register, swap primary and secondary registers, and more (see website)

• Improved import of HP-25 programs created by the GO-25 simulator.
("Share PRGM" to "Pasteboard" on GO-25, then long-press display of RPN-32 CE in program mode and paste.)

• Haptic feedback may be turned off and on:
– Store 1939010X in R0 to set amount of feedback
(where X = 0: no feedback, X = 3: maximum feedback)
(Hewlett-Packard Company was founded on Jan 1, 1939)
Bug fixes:

• Deleting a range of steps (DLx,y) did not correctly adjust targets of GTO and GSB in all cases
• Wrong translation of instruction RND imported from GO-25
• Angular mode didn't get exported when sharing in calculator view 3.2 09/02/2020 • Register view shows localized formatted value while number is being entered

Bug fix:
• Using scientific notation could crash the app in some regions, i.e. Australia, Sweden, Slovenia. 3.1 03/20/2020 • Support for iOS 13: Dark Mode, file sharing

• Email programs directly from the program list

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

• Many under-the-hood optimizations
Check out the new Download walk-through on the website (under "Sharing".)
Bug fixes:

• The keys GTO, STO, and RCL didn't cancel a pending flag command
• Executing the summation command ∑ with a very large argument would cause a crash
RPN-32 CE now requires iOS 11 or later. 3.0 01/25/2020 New features:

• New editing commands in programming mode:
– DELx,y: delete range of program steps
– DELEnd: delete steps from current position to end of program
Bug fix:

• The instruction GSB 90 could not be entered 2.8 08/12/2019 New features:

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

• New program "Curve Fitting" added 2.7 07/02/2019 Fixed crash on double-tapping GTO nn in program listing when step nn didn't exist 2.6 05/28/2019 • Register R.9 is now formatted in Register View for easy interpreting in ISG/DSE commands
Bug fix:

• Commands STi and RCi were not correctly assigned to key codes 2.5 04/06/2019 • Optional stack display (swipe display right/left)

• Indirect addressing of all 20 registers via the R.9 register (on f and g keys)

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

• Flags are now saved and loaded along with programs

• Warning on deleting program memory or program files

• On-screen error descriptions

• Improved reliability of comparisons

• New programs: Gamma Function (Spouge), Incomplete Gamma 2.4 02/05/2019 • New sample programs:
– "Solve for f(x)=0 Newton"
– "Simult. Equations in 3 Unknowns"
– "LogFactorial"

• Improved programs:
– "Simult. Equations in 2 Unknowns"
– "Fibonacci Numbers"

• Improved Program Listing (tap "?" in listing screen)

• New buttons at top to select TOP, MID or END of program

• Built-in descriptions of top functions (see Settings)

• Except on step 00, pressing R/S shows next command to be executed; releasing R/S starts executing

• Renamed button "Load" to "Save"

• Changed "Undo digit" sound to same as with other CuVee calculators

• Support for late 2018 iPhones
Bug fixes:

• Improved reliability of DSE and ISG commands
• Digit separators were not cleared when starting number entry with EEX 2.3 01/09/2019 • Improved compatibility with iPhone X
Bug fixes:

• Incorrect app icon shown when installed on iPad
• Number format issues and possible crash when using the EEX key 2.2.1 11/06/2017 New sample program added:
• Progressions (arithmetic, geometric, harmonic)

• Improved trig functions for extremely small angles

• Support for iOS 11
Bug fixes:

• Separators didn't always disappear when changing display mode to SCI or ENG
• Copied display values with exponent could be improperly formatted 2.2 10/24/2017 New sample programs added:

• First Order Differential Equations
• GCD and LCM (Greatest Common Divisor and Least Common Multiple)
• Rectangular / Hyperbolic Polar Coordinates Conversion
• Rectangular / Spherical Coordinates Conversion
• Sum of Digits Game 2.1 09/06/2017 • New program "Numerical Integration" (tap "Reload Sample Programs" to see it)
Bug fixes:

• RND didn't work correctly on certain values
• Deleting steps caused wrong address corrections in some cases 2.0.1 05/23/2017