RPN-55 SD
Classic HP Calculator w/Timer
$1.99
2.9for iPhone, iPod touch
9.9
6 Ratings
CuVee Software
Developer
17.7 MB
Size
Jan 13, 2024
Update Date
Productivity
Category
4+
Age Rating
Age Rating
RPN-55 SD Screenshots
About RPN-55 SD
RPN-55 SD is the first photo-realistic simulation for the iPhone of Hewlett-Packard's low-cost alternative to the famous HP-65 programmable scientific calculator. Produced from 1975 through 1977, it was the "Merlin" member of the classic HP calculator series, priced at $395. HP claimed that it featured "(...) more pre-programmed functions than any other scientific pocket calculator in the world."
A main feature of the HP-55 was a crystal-controlled 100-hr digital timer with the ability to store times while the timer was running and later recall them. On RPN-55 SD the timer may also act as a 12-hr or 24-hr clock, including date and weekday display.
While the simulator works just like the original calculator – except being much faster and having twice the program memory – you can turn on extended features to make it even more enjoyable to use.
RPN-55 SD comes complete with original HP programs built in.
Features:
• Photo-realistic look-and-feel
• Vintage mode or Extended mode
• Programmable (99 steps), conditional branching
• Insert and delete steps with automatic address correction
• Delete range of steps
• Subroutines (4 levels)
• 20 registers, "continuous", with unrestricted store/recall arithmetic
• "Live" register view
• Program listing view
• Program library view
• Store and retrieve any number of programs
• 100-hr timer supporting 10 split times and 12/24-hr clock mode with date
• Swap unit conversions with additional functions, e.g. hyperbolics
• Sharing: e-mail, AirDrop, Dropbox, copy, paste, print
• 112 programs pre-installed
Calculator functions:
• Statistics (linear regression, mean, standard deviation, correlation coefficient, x- and y-estimates)
• Trigonometric functions (degrees, radians, grads)
• Polar/rectangular conversions
• Inverse, square root, logarithm, exponential, pi
• Storage arithmetic (store and recall)
• Percent, absolute, integer, fractional value, round
• Factorial
• Random number
• Unit and hours conversions
Details: cuveesoft.ch/rpn55
A main feature of the HP-55 was a crystal-controlled 100-hr digital timer with the ability to store times while the timer was running and later recall them. On RPN-55 SD the timer may also act as a 12-hr or 24-hr clock, including date and weekday display.
While the simulator works just like the original calculator – except being much faster and having twice the program memory – you can turn on extended features to make it even more enjoyable to use.
RPN-55 SD comes complete with original HP programs built in.
Features:
• Photo-realistic look-and-feel
• Vintage mode or Extended mode
• Programmable (99 steps), conditional branching
• Insert and delete steps with automatic address correction
• Delete range of steps
• Subroutines (4 levels)
• 20 registers, "continuous", with unrestricted store/recall arithmetic
• "Live" register view
• Program listing view
• Program library view
• Store and retrieve any number of programs
• 100-hr timer supporting 10 split times and 12/24-hr clock mode with date
• Swap unit conversions with additional functions, e.g. hyperbolics
• Sharing: e-mail, AirDrop, Dropbox, copy, paste, print
• 112 programs pre-installed
Calculator functions:
• Statistics (linear regression, mean, standard deviation, correlation coefficient, x- and y-estimates)
• Trigonometric functions (degrees, radians, grads)
• Polar/rectangular conversions
• Inverse, square root, logarithm, exponential, pi
• Storage arithmetic (store and recall)
• Percent, absolute, integer, fractional value, round
• Factorial
• Random number
• Unit and hours conversions
Details: cuveesoft.ch/rpn55
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What's New in the Latest Version 2.9
Last updated on Jan 13, 2024
Old Versions
• Internal optimizations and cleanups.
• Modified Info screen to avoid clipping by the Dynamic Island.
• Modified Info screen to avoid clipping by the Dynamic Island.
Show More
Version History
2.9
Jan 13, 2024
• Internal optimizations and cleanups.
• Modified Info screen to avoid clipping by the Dynamic Island.
• Modified Info screen to avoid clipping by the Dynamic Island.
2.8
Dec 19, 2023
• Both slide switches may now be operated either by moving them with the finger, or by simply tapping them.
• The haptics level may be selected in Settings.
• Like on a real HP-55, executing SST on step 00 in RUN mode simply ends any user input value. The next SST will execute step 01.
• Runs on Apple Silicon Mac (see notes on homepage cuveesoft.ch).
• RPN-55 SD requires iOS 12 or later.
• The haptics level may be selected in Settings.
• Like on a real HP-55, executing SST on step 00 in RUN mode simply ends any user input value. The next SST will execute step 01.
• Runs on Apple Silicon Mac (see notes on homepage cuveesoft.ch).
• RPN-55 SD requires iOS 12 or later.
2.7.2
Jan 9, 2023
Like on a real HP-55, executing SST on step 00 simply ends any user input value.
The next SST will execute step 01.
The next SST will execute step 01.
2.7.1
Oct 9, 2022
• Fixes a crash when trying to Export a program
2.7
Sep 29, 2022
• Haptics
Set the haptic feedback level in the calculator's settings.
„Sounds & Haptics“ / „System Haptics“ must be on in the iPhone's settings.
• FileListView can be dragged down
Set the haptic feedback level in the calculator's settings.
„Sounds & Haptics“ / „System Haptics“ must be on in the iPhone's settings.
• FileListView can be dragged down
2.6
Apr 9, 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.
• Apply a filter to quickly find any program.
• Sample Programs may be hidden in the list of programs.
2.5
Oct 5, 2021
• Improved sample program "Solve f(x) = 0"
2.4
Dec 15, 2020
• Improved mail subject when mailing a program as PDF
• New sample program "TVM - Solve for i"
• Visual feedback when reloading programs in file list view
Bug fix:
• GSB command could not be pasted as text in PRGM mode
• New sample program "TVM - Solve for i"
• Visual feedback when reloading programs in file list view
Bug fix:
• GSB command could not be pasted as text in PRGM mode
2.3
Nov 8, 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
• Improved accuracy in extreme cases of y^x with positive, integer x.
For example, 1.0000001^(2^27) = 674530.4707, not 674530.4760
• New programs: "Nominal vs Effective Rate", "Num. Integration - Gaussian"
• 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
• Programs mailed in calculator view incorrectly showed step 00
• Double- or triple-tapping the empty program listing could cause a crash.
• A program running longer than one minute will emit a short beep when executing the final GTO 00 command
• Improved accuracy in extreme cases of y^x with positive, integer x.
For example, 1.0000001^(2^27) = 674530.4707, not 674530.4760
• New programs: "Nominal vs Effective Rate", "Num. Integration - Gaussian"
• 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
• Programs mailed in calculator view incorrectly showed step 00
• Double- or triple-tapping the empty program listing could cause a crash.
2.2
Sep 16, 2020
• n! now appears as x! in advanced mode to reflect the fact that the function can handle non-integer arguments.
• Added and updated sample programs. Be sure to tap "Reload Sample Programs" in program list.
Bug fixes:
• Fixed a bug occurring when single-stepping a programmed number input
• Automatic mode switching based on the loaded program didn't work as expected in some cases
• Added and updated sample programs. Be sure to tap "Reload Sample Programs" in program list.
Bug fixes:
• Fixed a bug occurring when single-stepping a programmed number input
• Automatic mode switching based on the loaded program didn't work as expected in some cases
2.1
Sep 2, 2020
• Stack shows localized formatted value while number is being entered
Bug fix:
• GTO/GSB to step 01 would halt program execution
Bug fix:
• GTO/GSB to step 01 would halt program execution
2.0
Jan 25, 2020
• Improved stack display (swipe display right to show):
- 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
• Decimal points now occupy a full digit position.
• In Vintage mode, non-zero values less than 1 are now shown without a leading zero, as does a real HP-55. In addition, numbers may be entered with leading zeros.
• In 12/24 hours timer modes, tap ENTER to switch between time and date with weekday display.
• Programs now always stop after a step 99 (instead of continuing at step 01)
• Single-stepping on number input ends input mode
• 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 fixes:
• Executing the summation command ∑ with a very large argument would cause a crash
• Automatic address correction would produce values larger than 99 in some cases
RPN-55 SD now requires iOS 11 or later.
- 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
• Decimal points now occupy a full digit position.
• In Vintage mode, non-zero values less than 1 are now shown without a leading zero, as does a real HP-55. In addition, numbers may be entered with leading zeros.
• In 12/24 hours timer modes, tap ENTER to switch between time and date with weekday display.
• Programs now always stop after a step 99 (instead of continuing at step 01)
• Single-stepping on number input ends input mode
• 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 fixes:
• Executing the summation command ∑ with a very large argument would cause a crash
• Automatic address correction would produce values larger than 99 in some cases
RPN-55 SD now requires iOS 11 or later.
1.2
Aug 14, 2019
• Improved LNx! function:
- Higher accuracy
- Now returns y and z such that x! = y * 10^z (where z is an integer)
• Program added: "Exponential & Log Curve Fit"
Bug fix:
• Sharing could cause a crash
- Higher accuracy
- Now returns y and z such that x! = y * 10^z (where z is an integer)
• Program added: "Exponential & Log Curve Fit"
Bug fix:
• Sharing could cause a crash
1.1
Aug 12, 2019
• Optionally replace unit conversions with additional functions (in Settings)
• Added "x-estimate" for a given y to linear regression functions. Note that the key for correlation coefficient (r) has moved one row up.
• Programs saved in vintage mode are now marked with a "V" in the listing view.
• Added programs "Hyperbolic Functions", "Gamma Function (Toth)", "Solve f(x)=0", "TVM with Unknown Interest" as well as all test statistics programs from the book "HP-55 Statistics Programs".
• Tight program loops with many repetitions will no longer cause the display updates to slow down.
Bug fixes:
• Pressing EEX when a number showing separators was displayed would not remove the separators
• Touching a main register value would not dismiss the register view
• The % function showed as 1/x in program listings
• Deleting a range of steps using g CLP in RUN mode could modify unaffected branch commands
• Added "x-estimate" for a given y to linear regression functions. Note that the key for correlation coefficient (r) has moved one row up.
• Programs saved in vintage mode are now marked with a "V" in the listing view.
• Added programs "Hyperbolic Functions", "Gamma Function (Toth)", "Solve f(x)=0", "TVM with Unknown Interest" as well as all test statistics programs from the book "HP-55 Statistics Programs".
• Tight program loops with many repetitions will no longer cause the display updates to slow down.
Bug fixes:
• Pressing EEX when a number showing separators was displayed would not remove the separators
• Touching a main register value would not dismiss the register view
• The % function showed as 1/x in program listings
• Deleting a range of steps using g CLP in RUN mode could modify unaffected branch commands
1.0
Jul 2, 2019
RPN-55 SD FAQ
Click here to learn how to download RPN-55 SD in restricted country or region.
Check the following list to see the minimum requirements of RPN-55 SD.
iPhone
Requires iOS 12.0 or later.
iPod touch
Requires iOS 12.0 or later.
RPN-55 SD supports English
