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# The HP15C corner

The HP-15C is a high-end scientific pocket calculator with a root-solver and numerical integration. A member of Hewlett-Packard Voyager series of programmable calculators, it was produced between 1982 and 1989. The processor used the then new technology of Silicon on Sapphire that allowed ultra-low consumption. The 3 button batteries provided often lasted decades!

For many users, it is the pinnacle of HP calculator engineering together with the HP42s. Due to its popularity, and based on the then-new HP12c ARM-based platform, it was reintroduced in 2011 as HP15c Limited Edition. It was 150 times faster than the original, but it had higher consumption and the batteries would last around 4 months or normal use.

On May 2nd, 2023 HP announced the new HP15c Collector's Edition: the new version, with more speed, more memory and more battery life than the previous iteration. You can reserve your unit now - deliveries will start in the second half of July 2023.

The main capabilities were outstanding, considering the limited keyboard:

• All kind of trigonometric functions, including inverses, hyperbolics and hyperbolic inverses, in degrees, radians and gradiants
• Logarithms (log(x) and ln(x)) and exponentials (10x and ex)
• % and % increase
• Conversions and number manipulations
◦ Rectangular to polar and vice-versa
◦ H.MS to decimal hours and vice-versa
◦ Degrees to radians and vice-versa
◦ Integer part and fractional part
• Complex numbers, working seamlessly on most available functions
◦ Full 4-level complex stack (instead of the two level of HP41 Advantage pac or Math pac)
◦ Real to imaginary exchange in a single step
◦ Rectangular to Polar and Polar to rectangular also work seamlessly with complex operands.
• Matrices, with full featured operations up to 8x8 size:
◦ Copy and paste matrices
◦ Multiplication, addition, subtraction – scalar and matrix
◦ Transposing a matrix – taking also care of the dimension change if needed
◦ Matrix inversion
◦ System solving – a short cut:  instead of A-1B you call to stack B, then A and divide!
◦ LU decomposition
◦ Determinant
◦ Row norm
◦ Frobenius norm
◦ Working with complex matrices in two different ways
• Basic statistics
◦ Permutations and combinations
◦ 2-variable statistics: sum of x, sum of y, sum of x2, sum of y2, sum of xy
◦ Average and standard deviation
◦ Linear regression
◦ Factorial, but not just the integer factorial (n!) but the extended non-integer version (gamma function)
• Integral for arbitrary functions (defined as programs)
• Solve: find the zeros of arbitrary functions, defined as programs
• Storage: up to 65 registers + I (index) register
◦ Register arithmetic to shorten programs and keystrokes: RCL+, STO+ and with the rest of arithmetic operators.
• Programming: up to 448 programming steps
◦ up to 25 labels: A to E, 0 to 9, .0 to .9
◦ GTO and GSB; use of index register

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### HP15C Collector's Edition

Product no.: HP-15c #INT_2

129.99 *
Product data sheet
In stock

450.00 *

### NewHP12C battery cover - new model

Product no.: HP12c cover[1]

16.00 *
Old price 17.00 €
In stock

### NewHP12C battery cover

Product no.: HP12c cover

9.00 *
Old price 12.00 €
In stock

19.00 *
In stock

### Leather cover set

Product no.: Leathercovers

60.00 *
* Prices include VAT

### HP15c new self test

Self test procedure for the HP15c Collector's Edition

### HP15c related pages

Some links to HP15c resources

### HP15c Videos

Some interesting videos about HP15c