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"...
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
Jan 13, 2024
Version 2.9
• Internal optimizations and cleanups.
• Modified Info screen to avoid clipping by the Dynamic Island.
Previous Versions
Here you can find the changelog of RPN-55 SD since it was posted on our website on 2023-09-25 11:09:02.
The latest version is 2.9 and it was updated on 2024-04-22 17:28:05. See below the changes in each version.
RPN-55 SD version 2.9
Updated At: 2024-01-13
Changes: Jan 13, 2024
Version 2.9
• Internal optimizations and cleanups.
• Modified Info screen to avoid clipping by the Dynamic Island.
RPN-55 SD version 2.8
Updated At: 2023-12-19
Changes: Dec 19, 2023
Version 2.8
• 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.
RPN-55 SD version 2.7.2
Updated At: 2023-01-09
Changes: Jan 9, 2023
Version 2.7.2
Like on a real HP-55, executing SST on step 00 simply ends any user input value.
The next SST will execute step 01.
Disclaimer
Official App Store Link
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