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


Version 1.5.2

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
 





HP35 Back Label

 

 

Version History


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
  • 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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