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

• List of known bugs for the HP15c LE
• Programming the HP15c
• Programs for HP15c
• HP15c simulator
• HP15c Programming tutorial - part 1
• HP15c Programming tutorial - part 2
• HP15c at the HPCC website
• HP 15C Programming Tutorial - Part 1: The Stack
• HP 15C Programming Tutorial - Part 2: Basic Programming
• HP 15C Programming Tutorial - Part 3: Registers
• HP 15C Programming Tutorial - Part 4: Test
• HP 15C Programming Tutorial - Part 5: Subroutines
• HP 15C Programming Tutorial - Part 6: Loops and Counters
• HP 15C Programming Tutorial - Part 7: Solve and Integration
• HP 15C Programming Tutorial - Part 8: The Summation Program
• HP 15C Programming Tutorial - Part 9: Derivatives
• HP 15C Programming Tutorial - Part 10: Statistics in Programming
• HP 15C Programming Tutorial - Part 11: Flags
• HP 15C Programming Tutorial - Part 12: Memory and Indirect Registers
• HP 15C Programming Tutorial - Part 13: Indirect Addressing and Subroutines
• HP 15C Programming Tutorial: Part 14 - Complex Numbers
• HP 15C Programming Tutorial - Part 15: Memory Exchange (Area of a Polygon)
• HP 15C Programming Tutorial - Part 16: Solving Multiple Input Equations (TVM Program)
• HP15c - Programs and information
• The Calculator Store's own HP15c software page