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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 Compare	HP 15c Scientific Calculator - USED 2 (Case: Original) 450.00 € * Compare	New HP12C battery cover - new model Product no.: HP12c cover[1] 16.00 € * Old price 17.00 € In stock Compare	New HP12C battery cover Product no.: HP12c cover 9.00 € * Old price 12.00 € In stock Compare
True leather case for HP12c, HP15c and Voyager calculators 19.00 € * In stock (20) Compare	Leather cover set Product no.: Leathercovers 60.00 € * Compare

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