Microcode-Level Emulation
The HP-15C.
Reborn.
MY15C is an HP-15C advanced scientific calculator emulator built on a different foundation. Not a simulation — a true microcode-level emulation of the original Nut processor.
Matrices, complex numbers, numerical integration, root solving — every instruction and undocumented quirk faithfully reproduced on your iPhone, iPad, and Mac.
Free 28-day trial, then a one-time $9.99 · iPhone · iPad · Mac
Why Microcode Matters
Most emulators approximate calculator behavior at a high level. MY15C operates at the deepest level possible — executing the actual microcode instructions of the original hardware.
Cycle-Accurate
Emulates the original Nut processor at the microcode level. Every calculation produces exactly the same result as the original hardware — including rounding, display quirks, and undocumented behavior.
Advanced Math
Matrix operations up to 8×8, complex number arithmetic, numerical integration, and a built-in root solver — plus 448 bytes of keystroke programming with labels, branches, and subroutines.
Native Experience
Built natively for Apple platforms with SwiftUI. Runs on iPhone, iPad, and Mac with a responsive interface designed for each form factor.
About the HP-15C
The Hewlett-Packard HP-15C, released in 1982 as the advanced scientific model of the legendary Voyager series, is widely considered the finest scientific calculator ever made. Matrix operations, complex number arithmetic, numerical integration, and root solving — all in the same slim, horizontal shirt-pocket form factor as the rest of the Voyager line — made it a cult classic among engineers.
MY15C preserves this legacy through microcode-level emulation — not by approximating what the HP-15C did, but by running the same microcode that powered the original Nut processor. The result is an emulator that is indistinguishable from the real hardware.
Read the Full HistoryComing Soon
Experience the Legend
MY15C is finishing up on the App Store for iPhone, iPad, and Mac — free 28-day trial, then a one-time $9.99.