RPN-35 SD — The first photo-realistic HP-35 simulator for the iPhone


Version 2.0.1

RPN-35 SD is a photo-realistic simulation of Hewlett-Packard's break-through scientific hand-held calculator.

On January 4, 1972, Hewlett-Packard announced the HP-35, world's first scientific calculator small enough to fit in a pocket - more precisely, Bill Hewlett's shirt-pocket. The HP-35 was an immediate hit with students, engineers, and scientists. Despite its steep price of $395 (more than $2,200 today), it sold ten times better than anticipated in the first year. It was discontinued in 1975.


Features













Settings


Tap the wrench symbol to access the settings screen:












Vintage Mode


In this mode, RPN-35 SD simulates a real HP-35 very closely:








    In Vintage Mode, the settings button (wrench) is shown in blue.





Enhanced Memory Mode


In this mode, available only if Vintage Mode is off, RPN-35 SD provides advanced register handling.







iPhone 6 Screenshots:


HP-35 Version 3






HP-35 Version 4 (iPhone X)
 





HP35 Back Label

 

 

Version History RPN-35 SD


2.0.1 – Mar 18, 2020
  • Bug fix:
  • • Calculations in scientific mode in regions not using "E" as exponent symbol (i.e. Sweden, Australia, Slovenia) would cause a crash.

2.0 – Jan 25, 2020
  • New:
  • • If RPN-35 is set to HP-35 version v1 ("Red dot") and Vintage Mode is on:
      1. Simulation of (rather weird) EEX key behavior, i.e. exponent not shown initially, CHS ignored after digit entry, no CHS toggling
      2. Simulation of additional known calculation bugs.
  • • HP-35 version 4 shows correct logo and label at the bottom (on applicable iOS devices.)
  • • Support for iOS 13 Dark Mode
  • • RPN-35 SD now requires iOS 11 or later.

1.7 – Aug 13, 2019

1.6 – Jan 7, 2019
  • New:
  • • Changed "Undo digit" sound to same as found on other CuVee calculators
  • • Internal optimisations
  • • Support of late 2018 iPhones

1.5.2 – Nov 6, 2017
  • New:
  • • Values containing blanks may be pasted into display

1.5.1 – Oct 30, 2017
  • New:
  • • Improved compatibility with iPhone X

  • Bug Fix:
  • • Incorrect app icon shown when installed on iPad

1.5 – Oct 24, 2017
  • New:
  • • Improved trig functions for extremely small angles
  • • Support for iOS 11 and iPhone x

1.4 – Oct 2, 2016
  • New:
  • • Improved results for SIN, COS, TAN with very large arguments
  • • Decimal addition/subtraction for higher precision
  • • Calculator sounds mix with background audio and have their own volume control

1.3 – Sep 2, 2015
  • New:
  • • If audio is playing on start-up, RPN-35 SD will not produce any sounds

1.2 – May 12, 2015
    • If RPN-35 is set to HP-35 version v1 ("Red dot") and Vintage Mode is on: 1. Simulation of (rather weird) EEX key behavior, i.e. exponent not shown initially, CHS ignored after digit entry, no CHS toggling 2. Simulation of additional known calculation bugs. See website for details. • HP-35 version 4 shows correct logo and label at the bottom (on applicable iOS devices.) Version 3 shows the same label as version 2. • Support for iOS 13 Dark Mode RPN-35 SD now requires iOS 11 or later.
  • New:
  • • Added info about how to access settings screen
  • • Fixed non-volatile memory not working

1.1 – April 8, 2015
  • New:
  • • HP-35 version 1 (with red dot)
  • • Settings and Info buttons may be set to invisible
  • • Low-battery situation shows one decimal point unlit, as depicted in the HP-35 User's Manual

1.0 – January 18, 2015
  • First public version.
 

 

RPN-35 SD is available here:

RPN-35 SD

 


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