RPN-38 CX — The first photo-realistic HP-38 simulator for the iPhone


Version 1.5

RPN-38 CX is a photo-realistic simulation of Hewlett-Packard's third-generation programmable financial calculator HP-38C.

Released in 1978/79, the HP-38C and HP-38E were the high-end business members of the so-called "Spice" series. The HP-38E was introduced first, followed a year later by the HP-38C which added continuous memory. They were discontinued in 1981 and 1983, respectively.


Features
















Settings


Tap the wrench symbol or double-tap the display to access the
settings screen:














iPhone 6 Screenshot:






 

 

Version History


1.5 – Feb 27, 2017
  • New:
  • • Better FRAC results for large arguments
  • • Program added: "Easter Date"

  • Bug Fix:
  • • RND is now ignored if SCI display format is active

1.4 – Oct 2, 2016
  • New:
  • • Easter date for 1583 thru 4099: set y = 0, x = year, execute DATE
  • • New command "D.MY/BEGIN?" to read mode switch. Tap "f", then mode switch to program.
  • • Calculator sounds mix with background audio and have their own volume control

1.3 – July 26, 2016
  • New:
  • • Pause activity is shown in main and register view
  • • Decimal addition/subtraction for higher precision

1.2 – June 3, 2016
  • New:
  • • Register view gets updated while a program is running
  • • Run/stop and single-step program without leaving register view
  • • Added copy of actual display to register view
  • • LastX may be used in register arithmetic operations, e.g. RCL + ENTER
  • • Tapping any key stops program execution
  • • SST and BST may be cancelled by dragging finger off key
  • • Shared programs include calculator settings and registers
  • • Improved handling of values pasted as text
  • • Improved address correction when deleting program steps
  • • Support for uncommon number groupings (e.g. India)

  • Bug Fixes:
  • • Fixed x ≤ y function involving very large numbers
  • • Fixed automatic target correction of GTO command at end of program memory
  • • Fixed an issue where RCL g R/S in some cases would not find a solution
  • • Fixed wrong key codes for g-shifted functions in bottom row
  • • Statistical functions didn't lift the stack correctly
  • • Text correction in sample program "Trigonometric Functions"
  • • Entering too many digits was not properly handled
  • • Self-check doesn't clear LASTx value anymore

1.1 – March 22, 2016
  • New:
  • • Support for odd-period calculations using simple or compound interest (like HP-12C)
  • • Guesses for IRR solutions may now be entered using RCL g R/S (see HP-38 manual)
  • • Registers, display format, mode switch setting, and odd-period flag are saved with programs
  • • Program loading sets display format, mode switch, and odd-period flag
  • • The setting of the mode switch is programmable
  • • Registers may be preset by pasting multi-line text into the display
  • • Current program step is shown below display. Tap to show or hide.
  • • In program mode, progress bar shows fill status of program memory
  • • User programs are listed separatedly from sample programs

  • Bug Fixes:
  • • GTO statements pasted into the display as text are handled correctly
  • • f 9 (to set 9 decimal digits) is now programmable
  • • GTO 25 was not programmable
  • • Fixed ∑- function producing error message
  • • Fixed sign conventions of simple interest function
  • • Fixed a number of stack-lift issues
  • • FV doesn't show as PV anymore
  • • Fixed crash on storing illegal counter value or using illegal register
  • • Fixed a possible crash on NPV and IRR calculations

1.0 – February 18, 2016
  • First public version.
 

 

RPN-38 CX is available here:

RPN-38 CX

 

 

Get RPN-38 CX and its sister app RPN-32 CE at a bargain:

The Spice Pac

 


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