#Iphone rpn scientific calculator pdf#
#Iphone rpn scientific calculator mod#
#Iphone rpn scientific calculator code#

(Yes, I still have mine 20 years later, and it still works perfectly.) It's more complex to implement, but has greater accuracy than the typical binary implementation used in computers and calculators.Īpp on iPod touch and original calculator, side by sideĪs you can see in the photo above, the iPhone/iPod touch implementation fills the 75 mm wide display while the actual HP-15C calculator is more like 126 mm wide. BCD assigns each decimal digit four bits.

#Iphone rpn scientific calculator code#

Hewlett Packard has taken the ROM code in the HP-15C and built it into an iPhone or iPod touch app that duplicates the function of the original calculator, even implementing the original Binary Coded Decimal (BCD) encoding. Those who grew up with this logic find it very hard to enter a long string of numbers and functions in the more conventional algebraic calculator, then trust the final answer when the '=' is struck. RPN logic uses a stack, like the Forth programming language, and one of its principal advantages is that every intermediate calculation is shown in the display, providing a visual sanity check on each mathematical operation. The HP-15C is a scientific calculator that uses the Reverse Polish Notation (RPN) that HP made famous.

For those who want to find out more or acquire one of these calculators, I've included some references at the end of this review. Also, to say that a generation of Baby Boomers grew up with a slide rule, then voraciously embraced the HP-35, 45, and 67 in the mid 1970s would also be an understatement. To say that there is extensive lore and literature surrounding HP calculators is an understatement. It's identical to the original calculator (iPod touch screen shot)

#Iphone rpn scientific calculator pdf#

Now, the famous HP-15C hand held calculator has been reincarnated, exactly, for the Apple iPhone, complete with a PDF of the original paper manual. After that, for over 35 years, HP has been producing great calculators. Hewlett-Packard is famous and revered for its line of scientific and financial calculators that launched with the HP-35 in February, 1972.

#Iphone rpn scientific calculator mod#

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