RPN-34 CE is a photo-realistic simulation of Hewlett-Packard's third-generation scientific calculator HP-34C.

Released in 1979, the HP-34C was the high-end scientific member of the so-called "Spice" series. It was discontinued in 1983.

RPN-34 CE is a massively enhanced, yet fully compatible version of the HP-34C.


Features

• Programmable (999 steps, 12 labels, 10 flags)


• Photo-realistic look-and-feel


• Full compatibility with the HP-34C


• 31 commands not available on the HP-34C


• Easier to use and enormously faster than the original calculator


• 21 registers always available (no memory allocation scheme)


• 80 additional registers (optional)


• Unrestricted STO and RCL register arithmetic, including the I register


• Improved MEM command showing last program step, labels in use, non-zero registers


• Key-click with volume control and optional key-glow


• Swipe left across display to correct wrong number entries


• Cut/copy/paste display values as well as program steps


• Show/hide stack by swiping display


• Show stack and memory registers by tapping display once


• Single-step programs while watching registers and command names


• Display and annotate programs. Navigate in program listing.


• Cut and paste any range of program steps


• 10 Sounds (programmable)


• Save, Print, Share programs, including AirDrop and Dropbox


• Print program listing and description, or mail them as PDF documents


• Battery indicator lights up when battery charge drops below 10%


• Convenient single-key shortcuts for SST, BST, DEL, TOP, END, Roll up, Roll down

• Decimal Point:
  Select how the decimal should be represented. Also defines the look of the 1000's separator.


• Top Bar:
  Keys used for creating and running programs, as well as extra functions.
  May be dimmed or turned off.
  Tap "Operations" to see descriptions of the top functions.


• Show Key Fronts:
  If enabled, tapping the h prefix key will highlight the hard-to-read functions printed
  on the key fronts. All (default) affects all keys, Lower only the white keys.


• Registers:
  Choose between the HP-34C's registers (R0–R.9 plus I), or use registers R0–R.9 plus R20–R99.
  Registers 20 and above are addressable indirectly only, via the I-register.
  Note that the range 0..99 may be used without restrictions; the I-register is kept separate.
  The command CLEAR REG clears the range defined by the switch setting, including I.
  This setting also determines which labels may be addressed indirectly (more).


• Integration Accuracy:
  Normally set to Norm. Select High or Best to improve results for certain integration calculations.
  Running time will increase with higher precision.


• Haptics:
  Set the desired level of haptic feedback on pressing any key.


• Key Glow Effect:
  If enabled, tapped keys are shortly highlighted. Useful if key-click sound is off.


• Show Prefix Indicators:
  If enabled, prefix keys like f, g, h, STO etc. will get a white outline as long as
  they are active. A prefix key may be tapped again to deactivate it.

• New:
• • After computing an integral, the "uncertainty" stack register Y contains the current
    Integration Accuracy setting (0 = Best, 1 = High, 2 = Norm). Details
• • The "Integration Accuracy" setting is now stored along with the program.
• • Added "–" following the step number in PRGM mode, as seen on a real HP-34.
• • On lengthy calculations, the display may show a string of "–" instead of staying dark.
• • Verified and cleaned-up most of the sample programs.
• • New sample programs added: Double Integrals and Memory Game and Trainer.
• • The default font for program listings is now Menlo (previously Courier New).
• • Changed the default setting for Show Key Fronts from Lower to All.

• Bug Fixes:
• • By accident, the previous version didn't drop the stack after executing yˣ.
• • Several illegal key sequences, such as "LBL CHS" or "LBL +", are now correctly suppressed.
• • "SOLVE lbl" showed correctly as "14 73 lbl" on the display, but as "14 .lbl" in the program listing (where lbl = 0..9, A, B).
• • In PRGM mode, two consecutive RTN steps could show up at the end of a program.

• New:
• • Unicode blanks are converted to regular blanks when pasting program text.
• • Added sample program "Grazing Goat"

• Bug Fixes:
• • Applying the integrate function to very large numbers could cause a crash.
• • The "What's New" would reappear even when told not to.

• Bug Fix:
• • Fixes an issue where program lines cut using "g PCut" would not always get pasted correctly.

• New:
• • Set the haptics feedback level in the Settings
• • Labels .0 and .1 may now be targets of branching via the I-register. Details

• New:
• • Change the program listing font with a simple tap on the button F
• • Sample Programs may be hidden in the list of programs
• • Apply a filter to quickly find any program

• New:
• • PDF Listing/Description shows improved subject when mailed
• • Updating the File List invokes visual feedback
• • Stopping a program refreshes the register view
• • Improved auto-clearing of flag F8

• Bug Fix:
• • ISG/DSE commands were susceptible to internal rounding effects

• New:
• • Print (or mail as PDF) the program or its description.
• • Improved accuracy in extreme cases of y^x with positive, integer x.
    For example, 1.0000001^2²⁷ = 674530.4707, not 674530.4760
• • Stack shows localized formatted value while number is being entered.
• • Call up "What's New" anytime from Info screen

• Bug Fixes:
• • Display issues when operating the iPhone in "Zoomed" mode
• • RND didn't work correctly in regions using comma as decimal point
• • Double- or triple-tapping the empty program listing area caused a crash

• New:
• • Improved LN(x!) function:
    – Higher accuracy
    – Now returns y and z such that x! = y * 10^z (where z is an integer)
• • If SOLVER is called from a program, and a root is not found, the program doesn't stop anymore.
    Instead, the next step is skipped. This allows iterative searching for roots under program control.
• • Improved stack display (swipe display right to show):
    – Doesn't cover top bar functions anymore.
    – 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
• • Replacing registers by pasting a program into the display is now optional
• • Support for iOS 13: Dark Mode, file sharing
• • iOS 11 or later

• New:
• • Long-press program listing to change font of description from proportional to non-proportional and vice versa.
• • New program "Curve Fit Automatic" added

• New:
• • Register I is now formatted in Register View for easy interpreting in ISG/DSE commands
• • New program added: "Locating the Moon"

• New:
• • Optional stack display (swipe display right/left)
• • Cut and paste any number of program steps
• • Set flags are shown as highlighted register numbers in Register View
• • Flags are saved and loaded along with programs
• • Select integration precision in Settings (Norm/High/Best)
• • Warning dialog on deleting program memory or program files
• • Improved reliability of comparisons
• • Added two program pacs ("Student Engineering Applications" and "Surveying Applications")

• Bug Fixes:
• • In rare situations, executing Integrate or Solve from the keyboard would not stop correctly after the calculation
• • Issues with branching via I-register

• First public version.

RPN-34 CE