Keep Your Retro Rig Alive: The drop-in 6809 CPU that revives vintage computers with modern muscle.

The tranZPUter project, pioneered by developer Philip Smart, is creating modern drop-in CPU replacements for defunct vintage computer chips. Using low-cost microcontrollers like the RP2350B, the project emulates classic processors like the Z80, 6502, and Motorola 6809 on an FPGA or MCU, solving a key problem in retrocomputing: the scarcity of original, irreplaceable integrated circuits.

The latest variant, the Pico6809, specifically targets systems based on the Motorola 6809 CPU—like the Dragon 32/64 and TRS-80 Color—which can no longer source original parts. Beyond just replacing a dead chip, it adds modern conveniences like virtual floppy drives, cassette emulation, and even network support, effectively upgrading these 1970s machines. This open-source hardware project is a clever, practical lifeline for preserving computing history, allowing enthusiasts to keep their beloved vintage systems running for decades to come.