The HP15C corner

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 calculator is able to handle complex numbers and matrix operations, it has also solver and integration routines. 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.

The main capabilities were:

  • Up to 220 programming steps, with indirect register addressing, and 15 labels.
  • Up to 65 registers - tradeable agains programming steps and matrix size.
  • Matrix algebra including matrix multiplication, inversion (up to 8x8 size), and equation system solving.
  • Integration of arbitrary functions defined as a program
  • Solving of arbitrary functions defined as program.
  • The most complete set of mathematical functions, including trigonometrics, hyperbolics and its inverse, conversions rectangular to/from polar, combinations and permutations, and many others.
  • Register arithmetics: RCL+, RCL*, RCL-, RCL/
  • Complex stack (all 4 stack levels and the Last X register) and complex arithmetics and even transcendental functions!

​We have no HP15c calculator at this moment, but from time to time we have units available, either from the original model or the later Limited Edition - so book this page in favorites and return often!

Some HP15c related links

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HP 15c Scientific Calculator - USED 2 (Case: Original)

450.00 *

New HP12C battery cover - new model

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Leather cover set

Product no.: Leathercovers

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* Prices include VAT

HP15c new self test

Self test procedure