App Detail » RPN-35 SD

What's New

• Haptics
– Set the haptic feedback level in the calculator's settings.
– „Sounds & Haptics“ / „System Haptics“ must be on in the iPhone's settings.
– Note that iPads have no haptics engine.

• Optimized Settings View for devices with Home button

• Compatibility with iPhone 14 Pro

App Description

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.

Experience this unique calculator that won HP the prestigious "IEEE Milestone in Electrical Engineering and Computing" in 2009.


Features:

• Photo-realistic look-and-feel
• Three skins: version 1, versions 2 & 3 (1973) and final version 4 (1974)
• Vintage mode
• Enhanced memory mode
• Key-click and key-glow, both optional
• Swipe left across display to correct wrong number entries
• Cut/copy/paste display value
• Display stack registers and all memory registers
• All decimal points but one light when iPhone battery charge drops below 5%


Vintage mode
In this mode, peculiarities of a real HP-35 are simulated:
- original speed of operation
- stack register Z copied to T on trig functions
- leading zeros may be entered
- a negative number may be entered by pressing CHS before or after the number
- a keyboard entry or RCL immediately following STO does not raise the stack
- for version 1 only: a number of known arithmetic bugs

Enhanced memory mode
- non-volatile stack and registers
- use registers 1 through 9 with HP-45-like register arithmetic
- register 0 works as LastX register

App Changes

• January 19, 2015 Initial release
• May 04, 2015 New version 1.1
• May 14, 2015 New version 1.2
• September 02, 2015 New version 1.3
• July 08, 2016 New version 1.3.1
• November 08, 2016 New version 1.4
• June 15, 2019 New version 1.6
• August 17, 2019 New version 1.7
• January 28, 2020 New version 2.0
• July 15, 2020 New version 2.0.1
• November 12, 2020 New version 2.0.2
• September 16, 2023 New version 2.1