About RPN-65 SD
World's first pocket computer! Now running on your iPhone. RPN-65 SD is the iPhone version of RPN-65 Pro, the first complete simulation of Hewlett-Packard's stunning HP-65 programmable calculator for iOS. Produced from...
World's first pocket computer! Now running on your iPhone. RPN-65 SD is the iPhone version of RPN-65 Pro, the first complete simulation of Hewlett-Packard's stunning HP-65 programmable calculator for iOS. Produced from 1974 to 1977 at an initial price of $795 (that's close to $5,000 today!), the HP-65 was a breakthrough. Not only was it programmable, it also contained a motorized magnetic card reader - and still fit into Bill Hewlett's shirt pocket. Experience this revolutionary calculator on your iPhone. With over 180 original HP programs included with the app, you can get started right away. "A work of art. Fantastic!" (MacBreak Weekly, episode 572) Features: . Virtual program and data cards . Virtual 2000-line paper tape printer supports AirPrint . Powerful database-driven card manager . Create, delete, label, and organize a virtually unlimited number of cards . Sharing: e-mail, AirDrop, Dropbox, iTunes, copy, paste, print . Paste existing HP-65 listings into RPN-65 and run them . "Live" display of stack, memory registers, program counter, flags . Reads program and data cards created by RPN-65 Pro . Reads data cards created by RPN-67 Pro/SD and RPN-97 Pro Run RPN-65 SD in any of 4 modes: 1 - Just like the original HP-65 2 - Like the original HP-65, but at much higher speed 3 - With many user-interface improvements, like backstep key or jump to any program step 4 - "Super-65" with 999 program steps, 120 labels, 120 registers, nested subroutines, and much more For details, free program downloads, calculator handbook and much more, visit the RPN-65 website: cuveesoft.ch/rpn65
Version History After tapping “Don't Show Again,” the button will be hidden instead of appearing greyed out. 4.4.1 Mar 8 • Improved compatibility with iPhone Air and iOS 26. 4.4 10/17/2025 • Faster startup – no delay until the first button press is recognized after switching on. • Card details view: new Cancel button in the Activities list allows easy dismissing. Or simply tap outside dialog. Bug fix: In program view (tap display in W/PRGM mode), selecting a label at the bottom didn't clear the current selection. 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 • (iOS 13 or later) The program listing view supports two fonts. Long-press the listing to switch. • Visual adjustments to iPhone 16 Pro and iPhone 16 Pro Max 4.1 10/30/2024 • Thousand separators are now supported in "High-Contrast Display" mode. • Toggle "High-Contrast Display": in Settings -OR- f double-tap display • Toggle "Thousand Separators": in Settings -OR- f triple-tap display • Swiping the empty 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 have been changed from Courier to Menlo for better legibility. • Screens "Paper Tape Printer", "Program Usage", and "Program Description" may be dismissed by dragging them down, in addition to swiping them horizontally. 3.9 02/14/2024 • If Enhancements are "Off", pressing a user-definable key A..E resets the prefix key g, as expected. • RPN-65 SD runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch). • RPN-65 SD 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 modes ("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 "High Contrast" is on. No indicators are shown in vintage modes ("Off" and "Fast"). 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 • Haptic feedback Set the haptic feedback level in the calculator's settings. „Sounds & Haptics“ / „System Haptics“ must be on in the iPhone's settings. • 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. 3.6 09/30/2022 • 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. • Small cosmetic changes Bug fix: • Fixed wrong step 75 in MATH 1-15A in the default database from 99 to 03 3.5 11/30/2021 • 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. A real HP-65 returns 674530.8761. • Call up "What's New" anytime from Info screen • Compatibility with iPhone 12 Bug fixes: • Fixed an occasional issue causing mail dialog to close prematurely • Fixed display issues when using the iPhone in "Zoomed" mode 3.4 11/04/2020 • Changed search scope in Card Manager: finding text in "Plus" cards has been replaced with finding text in "Instructions" • 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. • 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. 3.3 07/03/2020 • 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 • 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) 3.2 04/08/2020 • Added comparison instructions x
Previous Versions
Here you can find the changelog of RPN-65 SD since it was posted on our website on 2017-01-04 19:45:37.
The latest version is 4.4.1 and it was updated on 2026-06-20 17:49:45. See below the changes in each version.
RPN-65 SD version 4.4.1
Updated At: 2026-06-20
Changes: Version History After tapping “Don't Show Again,” the button will be hidden instead of appearing greyed out. 4.4.1 Mar 8 • Improved compatibility with iPhone Air and iOS 26. 4.4 10/17/2025 • Faster startup – no delay until the first button press is recognized after switching on.
• Card details view: new Cancel button in the Activities list allows easy dismissing. Or simply tap outside dialog.
Bug fix: In program view (tap display in W/PRGM mode), selecting a label at the bottom didn't clear the current selection. 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 • (iOS 13 or later) The program listing view supports two fonts. Long-press the listing to switch.
• Visual adjustments to iPhone 16 Pro and iPhone 16 Pro Max 4.1 10/30/2024 • Thousand separators are now supported in "High-Contrast Display" mode.
• Toggle "High-Contrast Display": in Settings -OR- f double-tap display
• Toggle "Thousand Separators": in Settings -OR- f triple-tap display
• Swiping the empty 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 have been changed from Courier to Menlo for better legibility.
• Screens "Paper Tape Printer", "Program Usage", and "Program Description" may be dismissed by dragging them down, in addition to swiping them horizontally. 3.9 02/14/2024 • If Enhancements are "Off", pressing a user-definable key A..E resets the prefix key g, as expected.
• RPN-65 SD runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch).
• RPN-65 SD 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 modes ("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 "High Contrast" is on. No indicators are shown in vintage modes ("Off" and "Fast").
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 • Haptic feedback
Set the haptic feedback level in the calculator's settings.
„Sounds & Haptics“ / „System Haptics“ must be on in the iPhone's settings.
• 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. 3.6 09/30/2022 • 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.
• Small cosmetic changes
Bug fix:
• Fixed wrong step 75 in MATH 1-15A in the default database from 99 to 03 3.5 11/30/2021 • 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.
A real HP-65 returns 674530.8761.
• Call up "What's New" anytime from Info screen
• Compatibility with iPhone 12
Bug fixes:
• Fixed an occasional issue causing mail dialog to close prematurely
• Fixed display issues when using the iPhone in "Zoomed" mode 3.4 11/04/2020 • Changed search scope in Card Manager: finding text in "Plus" cards has been replaced with finding text in "Instructions"
• 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.
• 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. 3.3 07/03/2020 • 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
• 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) 3.2 04/08/2020 • Added comparison instructions x < y and x < 0 in Plus mode
• Improved listing in Vintage mode
Bug fix:
• Using scientific notation could crash the app in some regions, i.e. Australia, Sweden, Slovenia. 3.1 03/17/2020 • Swiping left the card slot area shows program listing
• In the program listing, unused label names appear in gray
• Improved compatibility of vintage mode with a real HP-65
• Detail view of Card Manager shows calculator mode (RUN or W/PRGM, top-left)
• Support for iOS 13: Dark Mode, file sharing
Check out the new Download walk-through on the website (under "Sharing".)
RPN-65 SD 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 • Card texts for vintage mode cards were not centered on some devices
• Fixed a few inconsistencies occurring in vintage mode only 2.5 08/16/2019 • Backstepping all input digits is not logged as CLX in TRACE mode anymore
• Access RPN-65 homepage directly from info screen
• Many under-the-hood refinements
• Support of late 2018 iPhones
Bug fixes:
• After deleting a card, the first card would erroneously be selected
• D.MS operation didn't always convert 60 secs into 1 min 2.4 01/10/2019 • Extended paper tape sharing (AirDrop, Notes, Dropbox, and more) 2.3 08/17/2018 • Drag and Drop Support
Drag numbers and program lines from other parts of RPN-65 SD to the calculator display. Requires iOS 11.0 or later.
• Improved readability of register names in the calculator's stack view 2.2 06/25/2018
RPN-65 SD version 4.4.1
Updated At: 2026-03-08
Changes: After tapping “Don't Show Again,” the button will be hidden instead of appearing greyed out.
RPN-65 SD version 4.4
Updated At: 2025-10-17
Changes: • Improved compatibility with iPhone Air and iOS 26.
RPN-65 SD 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.
• Card details view: new Cancel button in the Activities list allows easy dismissing. Or simply tap outside dialog.
Bug fix: In program view (tap display in W/PRGM mode), selecting a label at the bottom didn't clear the current selection.
RPN-65 SD 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 SD version 4.1
Updated At: 2024-10-30
Changes: Oct 30, 2024
Version 4.1
• (iOS 13 or later) The program listing view supports two fonts. Long-press the listing to switch.
• Visual adjustments to iPhone 16 Pro and iPhone 16 Pro Max
RPN-65 SD version 4.0
Updated At: 2024-07-06
Changes: Jul 6, 2024
Version 4.0
• Thousand separators are now supported in "High-Contrast Display" mode.
• Toggle "High-Contrast Display": in Settings -OR- f double-tap display
• Toggle "Thousand Separators": in Settings -OR- f triple-tap display
• Swiping the empty card slot left opens the Card Manager.
• The default angular mode indicator DEG goes out after 2 seconds.
RPN-65 SD 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 have been changed from Courier to Menlo for better legibility.
• Screens "Paper Tape Printer", "Program Usage", and "Program Description" may be dismissed by dragging them down, in addition to swiping them horizontally.
RPN-65 SD version 3.8
Updated At: 2023-12-24
Changes: Dec 24, 2023
Version 3.8
• If Enhancements are "Off", pressing a user-definable key A..E resets the prefix key g, as expected.
• RPN-65 SD runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch).
• RPN-65 SD requires iOS 12 or later.
RPN-65 SD 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]
Disclaimer
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