Microcode-Level Emulation
The HP-12C.
Reborn.
MY12C is an HP-12C financial calculator emulator built on a different foundation. Not a simulation — a true microcode-level emulation of the original Nut processor.
Time value of money, amortization, NPV and IRR, bonds, depreciation, calendar math — every instruction and undocumented quirk faithfully reproduced on your iPhone, iPad, and Mac.
iPhone · iPad · Mac
Free 28-day trial, then a one-time $9.99
Why Microcode Matters
Most emulators approximate calculator behavior at a high level. MY12C 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.
Financial Toolkit
Time value of money with n, i, PV, PMT and FV, amortization schedules, NPV and IRR cash-flow analysis, bond price and yield, three depreciation methods, and calendar arithmetic — plus 99 lines of keystroke programming with branches, tests and loops.
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-12C
The Hewlett-Packard HP-12C, released in 1981 as the financial model of the legendary Voyager series, is the longest-lived calculator HP has ever made — and it is still in production today. Time value of money, amortization, discounted cash-flow analysis, bonds and depreciation, all driven by RPN in a slim, horizontal shirt-pocket form factor, made it the standard on trading floors, in banks, and in real-estate offices around the world.
MY12C preserves this legacy through microcode-level emulation — not by approximating what the HP-12C 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 HistoryExperience the Legend
MY12C is available now for iPhone, iPad, and Mac — free 28-day trial, then a one-time $9.99.