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Developer Rairii reports that classic Mac OS 7.6 and 9.2.2 have booted to the desktop on a Nintendo Wii as part of a port targeting GameCube, Wii and eventually Wii U hardware. The project is not ready for public release, and the account describes an early milestone rather than a finished or broadly tested system.
Classic Mac OS 7.6 and 9.2.2 have reached the desktop on a Nintendo Wii, according to developer Rairii, who reported the milestone in a guest post published October 29. The port remains unfinished and unavailable for public release, but the achievement shows the operating systems running beyond Apple hardware on Nintendo systems built around PowerPC processors.
Rairii said the work targets Nintendo’s GameCube and Wii, with Wii U support planned eventually. The systems use related chipsets associated with ArtX: the GameCube’s Flipper and the Wii’s Vegas, also known as Broadway’s platform successor in the source’s description, with later revisions and the Wii U’s Latte identified as part of the same hardware lineage. The developer characterizes the project as a port to PowerPC systems using these chipsets, rather than a finished consumer product.
The reported milestone followed work on the low-level startup environment. Classic Mac OS’s “New World” boot process uses a component called the Trampoline, which runs under Open Firmware. Rairii adapted OpenBIOS and modified the startup code to account for differences in memory layout and hardware mappings. The post also describes early storage support through devices connected to the consoles’ EXI bus, including an SD adapter and an IDE setup used for testing.
Rairii said the project began on June 22, 2025, when they forked OpenBIOS. The developer described the work as independent coding, reverse engineering and debugging, and said no coding agent or large language model was used. That account is the developer’s description of their process; the post does not provide an independent technical review or a public build for others to test.
Classic Mac OS Beyond Apple Hardware
The milestone is a demonstration of how far hobbyist reverse engineering can take software designed for a specific computer platform. Classic Mac OS relies on assumptions about PowerPC memory maps, firmware and device access; adapting its boot process to Nintendo consoles means addressing differences that are not visible at the desktop level but can prevent the operating system from starting at all.
For retrocomputing enthusiasts, the project could eventually offer another way to run classic Mac software on original Nintendo hardware. For now, the practical impact is limited: the developer says the port is not ready for release, and the report does not establish compatibility with applications, peripherals or ordinary user workflows. The news is the boot milestone, not a claim that the Wii can yet serve as a general-purpose Mac replacement.
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From Firmware to the Mac Desktop
Rairii said earlier work porting Windows NT to PowerPC systems and Mac laptops prompted an interest in classic Mac OS. The Wii project grew from that experience, with the developer aiming to reuse and adapt code while supporting more than one console generation. The report also credits another developer, Goldfish64, with an OpenBIOS port created for a separate Mac OS X project targeting Wii and Wii U; Rairii said some drivers from that work were useful, but that their own project had different targets and requirements.
Initial testing used the Mac OS ROM file placed on a FAT filesystem so OpenBIOS could load it. The post explains that this was a bring-up choice, not necessarily the final storage arrangement: FAT32 limits individual files to 4 GB, which could constrain later operating-system versions or disk images. Rairii also described patches to compensate for assumptions in the Mac startup code about physical addresses, memory regions and memory-mapped hardware. Those details indicate that reaching the desktop required platform-specific changes, not simply copying a Mac image onto a console.
““my work porting classic Mac OS to PowerPC systems with what I affectionately call ArtX chipsets” reached the desktop “for the first time.””
— Rairii, project developer
Release and Compatibility Remain Open
The report does not say when a public release might be available, or whether one is planned. It also does not provide a detailed test matrix showing which Wii revisions, GameCube models or Mac OS configurations have been tested. Although the post says versions 7.6 and 9.2.2 reached the desktop, it does not establish that either version is stable, that common software works, or that the same results can be reproduced by other users.
Some implementation choices remain provisional. Rairii described the EXI-IDE driver as inaccurate for real hardware and said it was being used with the developer’s modified Dolphin emulator for testing. The post also raises possible future changes to memory mapping, particularly for Wii U hardware. It is not clear which features will be needed for a usable release or what hardware support will be completed first.
Further Porting and Public Testing
Rairii’s post says the project is still under development and outlines further work on hardware-specific patches, memory mapping and storage. The developer’s stated targets include GameCube and Wii, with Wii U support as a longer-term goal. No release date, repository link for a finished build or schedule for public testing is specified in the report.
The next meaningful milestones would be evidence of repeatable boots on the targeted hardware, broader tests of operating-system functions and a release that outside users can evaluate. Until then, the reported achievement remains a developer-described proof of progress. The post says the developer intends to continue discussing challenges, but does not identify a date for a follow-up update.
Key Questions
What is the reported development?
Developer Rairii says classic Mac OS 7.6 and 9.2.2 have reached the desktop on a Nintendo Wii as part of a port for Nintendo PowerPC hardware.
Can the public download the port?
Not according to the report. Rairii says the project is nowhere near ready for public release, and gives no release date.
Which consoles does the project target?
The developer says the targets are GameCube and Wii, with Wii U support planned eventually. The post does not document completed testing on every target.
Does reaching the desktop mean Mac apps work?
That has not been established. The report describes booting to the desktop but does not provide a compatibility list or confirm that common applications and peripherals work.
When did development begin?
Rairii says the project began on June 22, 2025, with a fork of OpenBIOS.
Source: virtuallyfun.com
