RPN-65 Pro 4.6 - App Store

RPN-65 Pro version 4.6

Updated At: 2026-06-10

Changes: Version History • In the Card Manager ("Cards"), the green label fields of user cards may be edited in W/PRGM mode, with "Show Card Content" set to off. • Improved support of Silicon Macs. 4.6 Apr 9 Bug fix 4.5 Mar 11 • In the Card Manager ("Cards"), quickly scroll to the program code for any user key. For HP program cards, tap the corresponding label letter (A..E). For user program cards, tap the green label field. • Visual optimizations for iOS 26. 4.4 Mar 8 • Faster startup – no delay until the first button press is recognized after switching on. 4.3 05/11/2025 • In "Plus" mode, results such as 9.99×10⁹⁹ now appear correctly rounded both in the display and on the printer for all decimal point settings, e.g. DSP 1 (in contrast to the original HP-65). • Certain calculations, e.g. 100⁷⁵, caused the app to crash. 4.2 03/07/2025 • In "Cards": Easier navigation to first, current, or last program step (tap "?" for details). 4.1 11/04/2024 • Thousand separators are now supported in "Large Display Digits" mode. • In addition to using the Settings, you can toggle "Large Display Digits" by tapping f, then double-tapping the display. • Likewise, "Thousand Separators" may be toggled by tapping f, then triple-tapping the display. • Swiping the card slot left opens the Card Manager. • The default angular mode indicator DEG goes out after 2 seconds. 4.0 07/06/2024 • If "Enhancements" are set to "Off", loading an empty card will blink "0.00" and program memory will be cleared to NOPs, like on a real HP-65. • Some fonts changed from Courier to Menlo for better legibility. 3.9 02/14/2024 • In vintage mode, pressing a user-definable key A..E resets the prefix key g, as expected. • Fixed a crash on selecting a card other than the top card in the filtered card list. • RPN-65 Pro runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch). • RPN-65 Pro requires iOS 12 or later. 3.8 12/24/2023 • Backstepping from step 001 to 000 in modes UI and Plus is now supported. In addition, step 000 is labeled as "[TOP]". • In vintage mode, typing "GTO.digit" and "LBL.digit" would not start a number entry. • Also in vintage mode, single-stepping an instruction like LBL 5 would not be executed as on a real HP-65 when the mode switch was flipped to W/PRGM and back to RUN between steps "LBL" and "5". [Thanks, Vincent] 3.7.6 09/18/2023 • Improved compatibility in vintage mode ("Off" and "Fast") with a real HP-65. • In "Fast" mode, the program step is shown in W/PRGM mode. Tap it to show or hide. • In "UI" mode, step 100 may be addressed by "GTO.00". • In modes "UI" and "Plus", you can quickly backstep your program without leaving the RUN mode. Press g, then BST repeatedly. Press g again to end. • "Print Labels" (f1 LBL) is programmable in Plus mode. • "Cued Stops" are now supported (see HP-65 Owner's Handbook, Jan. 1974 p77 or July 1974 p95). • Refined appearance and working of the Save/Done button on the card description screen. • Fixed a number of graphical issues. • Fixed a crash on trying to load a card with register data protected by Touch ID or Face ID. 3.7.5 09/12/2023 • Enable or disable the flashing of pressed keys in the Settings ("Flash Keys"). • In enhanced modes ("UI" and "Plus"), the trigonometric mode indicator DEG appears only when "Large Display Digits" is on. No indicators are shown in vintage modes ("Off" and "Fast"). • Long-press the circled info button to call up the "What's New" screen. Bug fixes: • [Vintage mode] Entering a merged code instruction (e.g. g NOP) at step 100 now works correctly. • [Vintage mode] Single-stepping (SST) from step 100 in W/PRGM mode now shows 00 00, not step 01. 3.7 05/13/2023 Fixed: In W/PRGM mode, program changes didn't enable the "Write Card" button in the Card Manager. 3.6.1 11/11/2022 • Added external keyboard command cmd-T to edit program title in Card Manager. • Improved handling of program cards saved with registers: - In Card Manager, the switch "With Regs" is set if the program card contains registers. - If the calculator has different register values, you may modify the card by tapping "Write Card". - If all calculator register values are 0, tapping "Write Card" removes all registers from the program card. Bug fixes: • When using an external keyboard, some keys were unresponsive in iOS 15. • External keyboard command opt-L (for LSTx) didn't work. 3.6 09/30/2022 Bug fixes: • The Sound Volume setting returned to the default value on reloading the app. • With registers shown in landscape mode, rotating the iPad to portrait mode, then closing and restarting the app would display part of the register view behind the calculator. 3.5.1 02/18/2022 • Improved compatibility of Data Cards across the different Enhancements settings of the calculator. (Thanks, Matt!) • Clearing registers now affects register R0 in Plus mode only. Bug fix: • Fixed wrong step 75 in MATH 1-15A in the default database from 99 to 03 3.5 11/30/2021 • iPad mini (2021) compatibility 3.4.2 10/04/2021 • Fixed issue on pre-iOS 13 devices, where running RPN-65 in vintage mode set to DSP 9 would round to 8 digits 3.4.1 12/14/2020 • Improved accuracy in extreme cases of y^x with positive, integer x. For example, 1.0000001^(2^27) = 674530.4707, not 674530.4760 Bug fix: • Fixed an occasional issue causing mail dialog to close prematurely 3.4 11/04/2020 • Changed search scope in Card Manager: finding text in "Plus" cards has been replaced with finding text in "Instructions". Quickly find any card containing any text in the title, the description or the instructions, without ever touching the iPad's screen! • New external keyboard commands: - > : swaps registers R0…R9 and RA…Re - shift-cmd-S: thousand's separators on/off - control-rightArrow: skip to next label - control-leftArrow: skip to previous label - shift-control-option-N: turn on the calculator, eject any card, set W/PRGM mode and clear the program memory • Extended support for external keyboard in Card Manager: – option-cmd-upArrow: address top card – option-cmd-downArrow: toggle between program and data cards – cmd-upArrow: address previous card – cmd-downArrow: address next card – cmd-leftArrow: address previous category – cmd-rightArrow: address next category - cmd-return: select currently addressed card - cmd-F: enter search mode - cmd-return: exit search mode with currently addressed card Download the complete list of key commands from the cuveesoft.ch homepage. • Added two extra commands missing on the original HP-65. Available via external keyboard only: - % : Find percentage X of a number Y - option-% : Find percent increase or decrease from Y to X • f REG now clears the extra registers RA, RB, ..., Rd, Re • f CLx now clears only the extended registers R00...R99 • The current program step is always displayed in the editable listing, even when it is located in unused program memory. • In vintage mode, the RPN-65 stores the same numbers in R9 as the real HP-65 after performing the operations SIN, COS, TAN and their inverse on arguments 0 or ±1. Bug fix: • Cancelling the Card Manager in W/PRGM mode would result in the calculator only showing the first 100 steps. 3.3 07/03/2020 • Simplified installation of user background image via Files app (see website, "Settings") • Delete a range of program steps (x,y) by executing DEL in RUN mode • The command "clear all extended registers" (f CLx) brings up a warning dialog • Improved single-stepping when using an external keyboard • Key flashing may be turned off and on: - Store 19390101 in R1 to turn off - Recall 19390101 from R1 to turn on (Hewlett-Packard Company was founded on Jan 1, 1939) • Additional commands for external keyboard: – shift-K: stack display – option-P: π - control-$: NOP Download the complete list from the cuveesoft.ch homepage. Bug fix: • Labels of a user program card were not editable 3.2 04/08/2020 • Hardware keyboard support! Use your iPad's Smart Keyboard, or any Bluetooth keyboard, to do calculations, run programs, change views, adjust settings, control the printer, and more – without ever touching the iPad screen. Press and hold the cmd-key to see the most important commands. Type cmd-? to see which key does what. • Added comparison instructions x < y and x < 0 in Plus mode • Improved listing in Vintage mode • Portrait mode is back again! Bug fix: • Using scientific notation could crash the app in some regions, i.e. Australia, Sweden, Slovenia. 3.1 03/17/2020 • Improved compatibility of vintage mode with a real HP-65 • Supports Slide Over on iPadOS. For example, you can store program snippets in a Notes file, then simply drag them into the listing in Card Manager. Or even into the calculator display. • iOS 13 support: Dark Mode, file sharing • The rarely used portrait mode has been dropped Check out the new Download walk-through on the website (under "Sharing".) RPN-65 Pro now requires iOS 11 or later. 3.0 01/22/2020 • Fixed an issue in vintage mode where in rare cases a random number would show instead of the result • Fixed an issue in vintage mode where the step number was not correctly updated in W/PRGM mode 2.5.1 08/19/2019 • In Settings, stepping through background pictures now wraps around at range limits • Fixed a few inconsistencies occurring in vintage mode only 2.5 08/16/2019

RPN-65 Pro version 4.5

Updated At: 2026-03-11

Changes: Bug fix

RPN-65 Pro version 4.3

Updated At: 2025-05-11

Changes: May 11, 2025 Version 4.3 • Faster startup – no delay until the first button press is recognized after switching on.

RPN-65 Pro version 4.3

Updated At: 2025-05-11

Changes: • Faster startup – no delay until the first button press is recognized after switching on.

RPN-65 Pro version 4.2

Updated At: 2025-03-07

Changes: Mar 7, 2025 Version 4.2 • In "Plus" mode, results such as 9.99×10⁹⁹ now appear correctly rounded both in the display and on the printer for all decimal point settings, e.g. DSP 1 (in contrast to the original HP-65). • Certain calculations, e.g. 100⁷⁵, caused the app to crash.

RPN-65 Pro version 4.1

Updated At: 2024-11-04

Changes: Nov 4, 2024 Version 4.1 • In "Cards": Easier navigation to first, current, or last program step (tap "?" for details).

RPN-65 Pro version 4.0

Updated At: 2024-07-06

Changes: Jul 6, 2024 Version 4.0 • Thousand separators are now supported in "Large Display Digits" mode. • In addition to using the Settings, you can toggle "Large Display Digits" by tapping f, then double-tapping the display. • Likewise, "Thousand Separators" may be toggled by tapping f, then triple-tapping the display. • Swiping the card slot left opens the Card Manager. • The default angular mode indicator DEG goes out after 2 seconds.

RPN-65 Pro version 3.9

Updated At: 2024-02-14

Changes: Feb 14, 2024 Version 3.9 • If "Enhancements" are set to "Off", loading an empty card will blink "0.00" and program memory will be cleared to NOPs, like on a real HP-65. • Some fonts changed from Courier to Menlo for better legibility.

RPN-65 Pro version 3.8

Updated At: 2023-12-24

Changes: Dec 24, 2023 Version 3.8 • In vintage mode, pressing a user-definable key A..E resets the prefix key g, as expected. • Fixed a crash on selecting a card other than the top card in the filtered card list. • RPN-65 Pro runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch). • RPN-65 Pro requires iOS 12 or later.

RPN-65 Pro version 3.7.6

Updated At: 2023-09-18

Changes: Sep 18, 2023 Version 3.7.6 • Backstepping from step 001 to 000 in modes UI and Plus is now supported. In addition, step 000 is labeled as "[TOP]". • In vintage mode, typing "GTO.digit" and "LBL.digit" would not start a number entry. • Also in vintage mode, single-stepping an instruction like LBL 5 would not be executed as on a real HP-65 when the mode switch was flipped to W/PRGM and back to RUN between steps "LBL" and "5". [Thanks, Vincent]