Microcode-Level Emulation
The TI-59.
Reborn.
MY59 is the most accurate TI-59 programmable calculator emulator ever built. Not a simulation — a true microcode-level emulation of the original TMC 0501 processor.
Every instruction, every timing quirk, every undocumented behavior — faithfully reproduced on your iPhone, iPad, and Mac.
iPhone · iPad · Mac
Why Microcode Matters
Most emulators approximate calculator behavior at a high level. MY59 operates at the deepest level possible — executing the actual microcode instructions of the original hardware.
Cycle-Accurate
Emulates the original TMC 0501 4-bit processor at the microcode level. Every calculation produces exactly the same result as the original hardware.
Full Compatibility
Supports magnetic card programs, all Solid State Software modules, and the complete TI-59 instruction set — including undocumented opcodes.
Native Experience
Built natively for Apple platforms with SwiftUI. Runs on iPhone, iPad, and Mac with a responsive interface designed for each form factor.
Everywhere You Need It
Available on iPhone, iPad, and Mac.
iPhone
iPad
Mac
About the TI-59
The Texas Instruments TI-59, released in 1977, was the most powerful handheld programmable calculator of its era. With up to 960 program steps, magnetic card storage, and plug-in Solid State Software modules, it brought real computing power to engineers, scientists, and professionals worldwide.
MY59 preserves this legacy through microcode-level emulation — not by approximating what the TI-59 did, but by running the same microcode that powered the original TMC 0501 processor. The result is an emulator that is indistinguishable from the real hardware.
Read the Full HistoryExperience the Legend
Download MY59 and rediscover the calculator that changed everything.