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4.4 – Apr 16, 2018
- • If supported by the device, geo data returned by OP SYS/INFO now also includes the compass heading (in register R.09)
- • Improved pasting of values into display, e.g. by copying/dragging from paper tape
- • Pasting a value into the display is treated as user input by setting flag 3
- • Printer/Mail font changed to "bold"
- • Optimized printer and mail font colors
- • Insert blank line on paper tape (swipe left, select "Space") (RPN-67 SD)
- Bug Fixes:
- • Missing name of "Astronomy" section in Extra Functions
- • Non-responsive confirmation dialog after tapping "Cards" in Card Manager in iOS 11 (Pro versions)

4.3 – Dec 11, 2017
- • New extra functions:
Swap primary and corresponding statistical or non-statistical registers [±11]
Copy/retrieve stack and A..E to/from registers R.00..R.08 [±12]
Print localised date or time or name of day of week [20,-20,21]
Print the device name, e.g. iPhone 8 [22]
Print the iOS version, e.g. iOS 11.2 [-22]
Print text on same line as result [±25]
Convert Gregorian Date to or from Julian Date [±650]
Convert Calendar Date to or from Julian Day Number [±651]
Convert Universal time to or from Greenwich mean sidereal time [±655]
- • Values containing blanks may be pasted into display
- • Changed register order in STO/RCL/XCH STK commands (see here)
- Bug Fixes:
- • Commands like "STO ." are now correctly ignored in vintage mode
- • In TEXT Helper, the onscreen keyboard doesn't cover the bottom-most input field anymore in landscape mode

4.2 – Oct 26, 2017
- New:
- • Improved trig functions for extremely small angles
- • Support for iOS 11

4.1 – Sep 14, 2017
- New:
- • New extra functions:
Solve first-order ordinary differential equations
Zeta function ζ(x)
Calculate Lambert W function value of x
Bernoulli numbers
PopCount(x): number of 1's in binary representation of x
High-precision geodesic distance between two locations on Earth
Set overflow value including infinity symbol ∞
Normalized sinc(x) function
- • Commands POP and POP A..E duplicate bottom of stack
- • DOW command changed to show ISO weekday numbers
- • DOW command also returns day number of the year and week number of the year
- • Display symbol ∞ for infinite results
- • New program category "Hydrology & Hydraulics"
- • EXT 1 deletes range of program memory steps defined by x and y (RPN-97 Pro only)
- Bug Fixes:
- • EXEC FN -97 (Set Pause) didn't work
- • RTN could set program counter to zero when it shouldn't
- • OP DIV command now follows ANSI standard if y and x have different signs

4.0 – July 11, 2017
- New:
- • New functions and utilities:
Numerical Integration
Root Finder
Matrix Operations
Quartic Function Solver
Linear Equation Solver
Primality Test
... and much more
- • New command OP EXEC FN supports extensible function library
- • Supports "secret" NOP command of HP-67
- • Polar/Rect conversions support complex and hyperbolic modes
- • Loading an auto-executing program card optionally plays a short alert sound
- • Printing x in complex mode prints both real and imaginary parts
- • Flag F9 (used in Find Root operation) appears in register view
- Bug Fixes:
- • SYS/INFO didn't show correct version number
- • No more empty line printed after x≷i
- • Crash on register operations involving registers A..E in complex mode
- • Sound volume was not preserved between restarts (RPN-67/97 Pro only)

3.9 – April 26, 2017
- New:
- • Card Manager:
On opening or changing card, the currently addressed program step scrolls into view automatically
Tap label "Next:" to scroll the currently addressed program step into view
Tap label "Steps:" to see the top of the listing
Tap the value following "Steps:" to see the bottom of the listing
- • Visual feedback on tapping keys (vintage mode)
- • Additional mnemonics recognised when importing programs as text
- • Changes in card merging for improved compatibility with vintage programs
- • Card reader sound in vintage mode taken from real HP-67 (used to be HP-65) (RPN-67 only)
- Bug Fixes:
- • In vintage mode, after switching to W/PRGM, the code of the last tapped key in RUN mode would sometimes not disappear (RPN-67 only)
- • Keys in lowest four rows move again on tapping (RPN-67 only)
- • Shared data cards didn't include extended registers
- • Pi in vintage mode was not restricted to 9 decimal digits
- • Some extended commands imported from RPN-67 didn't get translated (RPN-97 only)

3.8 – March 7, 2017
- New:
- • Enjoy the genuine HP card reader sound in vintage mode!
- • Better FRAC results for large arguments
- • Repeatedly pressing prefix keys f,g,h in vintage mode works like on real HP-67 (key f only on RPN-97)
- Bug Fixes:
- • RND didn't work in FIX mode (RPN-67 Pro only)
- • RND didn't round correctly certain values in SCI and ENG mode
- • Fixed some issues regarding Touch-ID-protected registers

3.7 – Feb 7, 2017
- New:
- • Search: Now faster and more powerful than ever. Search in program titles or descriptions.
- • On Touch-ID-enabled devices, access to calculator registers stored on program cards may be restricted
- • New command: g EEX ENTER exchanges LastX and the stack registers with extended registers 00..04
- • New flag commands:
DSP h SF n toggles flag n, then tests if it's set
DSP h CF n toggles flag n, then tests if it's cleared
DSP h F? n toggles flag n
- • Step number display may be toggled in vintage mode
- • Added card category "My Programs"
- • Optional dot-matrix font for paper tape in vintage mode (use OP PRT MODE command to set)
- • Low-battery indicator moved to correct position (RPN-67 Pro only)
- • Pacs "Business Decisions Pac I" and "Surveying Pac I" added to default database
- Bug Fixes:
- • Low-battery indicator didn't show in vintage mode
- • Flag tests 4..9 imported from RPN-67/97 did not get translated
- • In Card Manager, listing text may be selected on write-protected card
- • On iPod touch (5th gen) only, the app could crash on loading a data card (RPN-67SD only)

3.6 – Nov 16, 2016
- Bug Fix:
- • R/S command could not be pasted into display

3.5 – Sep 9, 2016
- New:
- • Easter date for 1583 thru 4099: set y = 0, x = year, execute DAT+
- • Added register arithmetic in complex number mode for R0...R9
- • Store, recall, exchange, and arithmetic operations involving X and any stack register
- • Next step number display (tap above "OFF" to toggle)
- • Red progress bar shows fill status of program memory (in W/PRGM mode)
- • Paper tape capacity increased to 2000 lines
- • TEXT command accepts codes 1..255
- • Register operations involving registers A..E may be entered as text
- • Improved pasting from paper tape
- • Indicator lights up when auto-executing subroutine 99 is running
- • Improved results for SIN, COS, TAN with very large arguments
- • Decimal addition/subtraction for higher precision
- • New option for PRT MODE command allows postponing papertape updates until the program has stopped running
- • Added German version of HP Standard Pac diagnostic program to default programs
- • HP Business Decisions Pac shows real cards
- • Calculator sounds mix with background audio and have their own volume control
- • Programs run faster than ever
- Bug Fix:
- • STO op (i) entered as text was stored as STO / (i) for all operations

3.4 – June 10, 2016
- New:
- • Long-press a paper tape line to copy it to the pasteboard
- • Long-press and drag a paper tape line to the display to copy/paste it
- • Copy text from usage window to pasteboard
- • Use DSP MODE to define decimal point character to use: auto (defined by locale), or decimal point, or comma
- • Group separator is shown while entering number
- • Support for uncommon number groupings (e.g. India)
- • Double-tap card in card list to load it
- • LBL, GTO, GSB with extended labels may be entered in mnemonic form, e.g. LBL 67
- • Operations and Constants keys show their code number
- • Low-battery dot moved to its correct position (RPN-67)
- • In vintage mode, Pi is set to exactly 3.141592654
- • Updated physical constants to CODATA 2014
- • Tweaked display for even more realistic look
- • Added HP Math Pac 1 and HP Stat Pac 1 to default database
- • HP Survey Pac 1 now shows real card images (after re-download of cards)
- Bug Fixes and Other Changes:
- • Fixed argument checking for NBIN and POISSON functions
- • Tapping g, then EEX would show wrong key name
- • Stopping program by touching SST key would not always behave as expected
- • Improved reliability of merging programs
- • Complex mode is cleared on loading new program card
- • Pressing a user-defined function key ends number input mode

3.3.1 – Mar 2, 2016
- Bug Fixes:
- • Wrong keyclick sound, causing key response to feel sluggish
- • Label "Registers" for Data cards was truncated

3.3 – Feb 17, 2016
- New:
- • Exchange cards with RPN-97 and RPN-65 via copy/paste
- • Import cards directly from e-mail
- • Import cards from this website without using iTunes
- • Save cards to Dropbox; import cards from Dropbox
- • Print card texts or save as PDF in iBooks
- • Exchange cards via AirDrop
- • Auto-execute label 99 on loading program card
- • Tap "Errors" to scroll to next syntax error in listing
- • Double-tap "Errors" to scroll to next address error in listing
- Bug Fixes and Other Changes:
- • If no mail app active, no warning appears until trying to e-mail
- • Fixed crash when translating HP-97 x≷ command
- • RPN-97 data cards are now imported correctly

3.2 – Sep 2, 2015
- New:
- • Added interactive "GTO.." command to quickly jump to last program step
- • If audio is playing on start-up, RPN-67/97 will not produce any sounds
- • Imports data cards created by the HP-65 simulator RPN-65 Pro
- Bug Fixes and Other Changes:
- • Operations involving extended register 25 didn't work in programs
- • Separators suppressed if "Crd" shown
- • Improved overflow handling in programs
- • Import/Export popup could show wrong card type (pre-iOS8)
- • Fixed issues related to paper-feeding an empty paper tape
- • PrintX key would print ERROR twice in NORM and TRACE mode
- • Removed some potential crash situations
- • Fixed card export hanging in iOS 8 (RPN-97 Pro only)
- • Fixed e-mail issue in Card Manager (RPN-97 Pro only)

3.1 – Apr 9, 2015
- New:
- • Direct Paper Tape Printing:
- Quickly append any text to the paper tape
- Swipe left on any line to delete it
- Insert text or blank line before any line (on iOS 8 or later)
- Great for annotating your calculations
- Bug Fixes and Other Changes:
- • In TEXT Helper: PLOTC input fields were covered by on-screen keyboard
- • Flag operations for F4..F9 not translated correctly when importing an RPN-97 card
- • Register view would freeze after removing or changing a program card (RPN-97 Pro only)

3.0 – Feb 28, 2015
- New:
- • Turbo mode
Now run programs faster than ever. Simply turn on Turbo mode, even under program control, to markedly speed up
execution of time-consuming calculations. All unneeded display and register view updates will be suppressed while
Turbo mode is on.
See OP SYS/INFO command on the website for details.
- • Program listing shows number of errors
- • Program instructions may be sent to external printer (AirPrint)
- • Nicer looking printouts, color/grayscale supported
- • Key fronts shown when tapping the h key may be determined in settings (RPN-67)
- • Improved sound volume control
- • OP STEP# replaced by OP PRT FRAC (fractional part as integer)
- • OP SYS command may be used to turn large digits on or off
- • Card searching scopes have been removed, so it's much easier now to find a card and its associated program or data cards.
- • 64-bit support
- Bug Fixes and Other Changes:
- • A single plus sign pasted into the listing treated correctly as addition command
- • Both "hyphen-minus" and "Unicode minus sign" are accepted when pasting
- • GTO+(i) and GSB+(i) are working again
- • Calculator didn't turn itself on automatically (iOS 8)
- • If large digits set, reg view x is shown in orange
- • After importing a card, the conversion switch is turned off
- • Turning calculator off while entering number stores number as x value
- • RCL ∑, STO ∑, x≷∑ changed to RCL ∑+, STO ∑+, x≷∑+
- • Added SIGMA+ and SIGMA- as synonyms for ∑+ and ∑-
- • Added X-BAR as synonym for x̅
- • If SST in subroutines is off, stopping in subroutine re-enables SST at that level

2.7 / 1.7 – Sep 16, 2014
- New:
- • TEXT Helper
Creating text for paper tape output in your programs has never been easier.
Simply open the new TEXT Helper screen, type in your text, and let RPN-67 insert the necessary program
steps into your program. No more looking up ASCII codes!
TEXT Helper also supports code creation for the PLOTC command.
- Bug Fixes and Other Changes:
- • Fixed crash on invalid values submitted to OP TEXT command
- • Fixed single-step mode not ended by executing user-defined function
- • Fixed manually entered commands GSB [0..9] producing incorrect opcode (RPN-67 only)
- • Fixed paper tape sometimes not showing content of previous session (RPN-97 only)
- • Fixed register commands involving ∑+ not working (RPN-97 only)

2.6 / 1.6 – Sep 3, 2014
- New:
- • 100 additional labels 00..99!
To use, simply enter LBL+nn, GTO+nn, GSB+nn (where nn = 00..99).
GTO+(i) and GSB+(i) take the absolute integer value in register I as target, if in the range 0..99.
- • Changed some matrix operations for easier use in programs. Row 1 is now mapped to registers R1..R3, row 2 to R4..R6, row 3 to R7..R9. Please check your programs which use OP MAT commands.
- Bug Fixes and Other Changes:
- • Fixed info button showing Breakpoint Commands instead of info screen on startup
- • Fixed LBL commands appearing twice on paper tape in NORM and TRACE mode
- • Fixed color formatting info appearing on paper tape printouts
- • Fixed paper feed button not responding in single-step mode

2.5 / 1.5 – July 7, 2014
- New:
- • BREAKPOINTS: Store and manage up to 10 program step numbers as breakpoints
- • SOURCE CODE ENTRY: Enter and edit programs by simply typing commands in the listing area
- • Card manager shows current program counter (and x value in RUN mode)
- • If warnings are turned off in settings, merge operations won't put up a dialogue anymore
- • Register arithmetic may be performed on register I
- • Command SYS/INFO is now programmable. In addition, it can provide geo location data (latitude, longitude, altitude.)
- Bug Fixes and Other Changes:
- • Fixed FRAC function in rare cases
- • Fixed a crash which could happen when cancelling a programmed MERGE operation
- • Programmed W/DATA command doesn't end program
- • Wider labels in card manager to better match card
- • In card manager: Flags, Trig Mode etc. grayed out if write-protected
- • Convert button disabled on write-protected card
- • Save button disabled for pgms on data card (and vice versa)
- • Register view: colors matching those of RPN-97
- • g EEX [A-E] in W/PRGM mode with cleared program doesn't store default function
- • Changing to PRGM mode stops program immediately, except in vintage mode
- • OP descriptions use smaller font

2.3 / 1.1 – April 3, 2014
- New:
- • Print in 10 colors (programmable; use PRT MODE command to select)
- • Negative results print in red (optional)
- • Merging a card with no card in slot will show merged card
- • Data cards containing less than 100 extended registers load correctly
- • Improved y^x function, e.g. (-9)^4 will not produce complex result anymore
- • LBL/FLG command replaced by more powerful SYS/INFO command
- • Changed plotting symbol from "+" to "•"
- • New card category "Tests & Demos"
- Bug Fixes and Other Changes:
- • Fixed a crash which could occur when trying to convert already converted HP-97 code to HP-67 again
- • Command DSP MODE didn't work in ENG notation
- • Rounding in SCI and ENG notation now works correctly
- • In vintage mode, key labels are now shown correctly for flag operations
- • Certain register arithmetic operations could not be programmed
- • Corrected description of command CHG MAG
- • Listing changes no longer a requirement for enabling HP-67/HP-97 conversion
- • Trying to add step beyond last step now behaves as expected
- • Some commands like RCL/STO.-51, RCL/STO.+61 were not programmable

2.2 – February 21, 2014
- New:
- • Full compatibility with RPN-97 Pro v1.0
- • Register operations involving (i) will automatically use extended registers if i exceeds 25
- • Improved compatibility with program listings pasted from external sources
- • Enlarged size of paper tape and instruction sheet
- • HYP mode may be toggled on and off
- • Avogadro constant: renamed and changed to latest value
- • Display shows low-battery indicator when the iPad's battery charge drops below 10%
- Bug Fixes and Other Changes:
- • Exchanging x with an extended register didn't work for certain registers
- • Fixed CPLX and HYP modes, as well as accessing register 24, not working in programs
- • Fixed and improved MERGE operation
- • Fixed crash on illegal range in PRT EXT command
- • Removed stack lift on RCL ∑ command
- • Paper clear sound not suppressed if key click vol = 0
- • Auto-Enter preserved across print commands
- • Subroutine nesting set to 3 levels in vintage mode (same as real HP-67)
- • Manual PAUSE length is not doubled anymore

2.1 – December 12, 2013
- New:
- • Speed improvements: programs run faster than ever, especially with register view hidden
- • Now with 30 backgrounds to choose from, PLUS import your own background image
- • Added program categories "Astronomy" and "Pharmacology"
- • In W/PRGM mode, insert a program snippet by simply pasting it into the calculator display
- • Replaced BOND function with SOLAR, which calculates precise sun position data
- • Enhanced extended function "FIND EXT" - you can now test a range for a value different from x
- • Program usage notes edited for iOS 7 compatibility. Download programs from Library sections if needed.
- • In Vintage mode, program run times match a real HP-67 even better
- Bug Fixes and Other Changes:
- • Usage view didn't show in certain situations
- • Fixed animation issues with keys in 4th row
- • Disabled automatic stack lift following ∑+ key
- • On executing PAUSE, tapping and holding a key now extends pause
- • Fixed a rounding issue in the FRAC function
- • Fixed size issues with data cards
- • Possible crash when removing label function and tapping label name
- • Editing lower row of labels in landscape mode doesn't shift up view excessively
- • Importing card with unknown category doesn't crash category picker
- • Improved cut/copy/paste
- • Increased line height in paper tape slightly

2.0 – September 27, 2013
- New:
- • Added more than 100 operations and functions (programmable)
- • Added 100 constants and conversions (programmable)
- • Added 100 registers supporting full register arithmetic and indirect addressing
- • Added flags F4 through F9
- • Exchange x with any register
- • Complex number mode
- • Hyperbolic functions
- • Decimal point is shown according to region
- • Display shows thousands separators (optional)
- • Single-step numeric constants in programs (optional)
- • N! accepts real and complex numbers
- Other changes:
- • Pasting a program step into the display works correctly (again)
- • In interactive mode, flag commands were not logged on paper tape

1.2 – June 6, 2013
- New:
- • Additional functions for the user-defined keys A through E
- • Faster execution of Printx command, if printer running and visible
- • Improved preview of background patterns in settings dialog
- • Duplicate cards are numbered
- • Warning when loading card which exceeds size of program memory
- • File extension changed to the more specific ".rpn67".
The previous extension ".plist" is still recognized.
- Other changes:
- • Fixed possible crash when creating a new program card
- • Eliminated possible spurious keyboard inputs showing up in Trace mode
- • Fixed an issue where paper tape results dropped two decimal digits
- • Fixed data cards not storing floating-point numbers correctly in certain regions
- • Fixed pasting values dropping decimal point in certain regions
- • Fixed a situation where the stack would not auto-lift

1.1 – May 2, 2013
- New:
- • Added the HP-97's NORM and TRACE mode to the printer
- • Print program listing on paper tape
- • Tap a button to scroll to top or bottom of paper tape
- • Tap "Cards" title in card manager to toggle between current and loaded card
- • Double-tap "Cards" title in card manager to toggle between program and data cards
- • Touch a button to reveal fronts of hard-to-read keys
- • Slowed down REG, -x-, STK commands to HP-67 speed when printer is not visible
- • Card manager enhancements
- • The card import function now accepts arbitrary card names
- • Cards with the extension ".hp97" (Windows HP-67/97 emulators) may be imported
- • Various UI and internal improvements
- Other changes:
- • Fixed crash occurring when tapping Paper Feed in W/PRGM mode
- • Fixed register I showing only very quickly in REG command
- • F3 is set on starting number entry with EEX
- • R/S finishes input mode
- • Register arithmetic now underflows correctly to zero
- • Print x key ends input
- • R/S ends input (also when running program enters number)
- • REG ends input
- • F? n renamed to Fn?
- • Programm stack cleared on manually entered RTN
- • Improved comparisons (based on display accuracy)
- • Improved INT, FRAC (based on display accuracy)
- • Vintage mode: display mode reset to FIX 2 on power-off
- • Enhanced mode: flags, trig mode stored in preferences

1.0 – March 1, 2013
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