Last Mac Capable of Booting Mac OS 9 Natively

The final official Macintosh model capable of natively booting into Mac OS 9 was the Power Mac G4 (Mirrored Drive Doors 2003), introduced on June 23, 2003. While Apple had aggressively begun phasing out Mac OS 9 support in favor of Mac OS X, demand from audio professionals, print publishers, and enterprise users forced the company to bring back an OS 9-bootable workstation. This machine, officially discontinued in June 2004, marked the end of the Classic Mac OS era that began with the original Macintosh in 1984.

The Context Behind the Machine

At the 2002 Worldwide Developers Conference (WWDC), Apple CEO Steve Jobs held a mock funeral for Mac OS 9, signaling that all future hardware would boot exclusively into Mac OS X. By January 2003, Apple rolled out updated Power Mac G4 lines featuring FireWire 800 ports that completely removed the ability to boot natively into Mac OS 9, restricting legacy software usage strictly to the Mac OS X "Classic" emulation environment.

However, many professional industries—particularly music production and prepress publishing—relied heavily on hardware and proprietary software that depended on direct, low-latency access to hardware through native Mac OS 9 extensions. Hardware such as Pro Tools DSP cards and legacy scanners could not function properly through the Classic environment.

The Power Mac G4 (MDD 2003)

In response to customer pushback, Apple reversed course on June 23, 2003, and re-introduced an updated version of the Mirrored Drive Doors (MDD) platform specifically designed to boot Mac OS 9.2.2.

Key aspects of this release included:

  • Hardware Adjustments: Apple removed the FireWire 800 controller used in the earlier 2003 models, replacing it with standard FireWire 400 ports. This was necessary because Apple never developed Mac OS 9 drivers for FireWire 800.
  • Configurations: The machine was initially sold with a single 1.25 GHz PowerPC 7455 (G4) processor, and a dual 1.25 GHz configuration was also made available.
  • Dual-Boot Capability: The machine shipped with both Mac OS X 10.2.6 (Jaguar) and Mac OS 9.2.2 pre-installed, allowing users to choose their startup disk.

Legacy and Retirement

Apple sold the Power Mac G4 (Mirrored Drive Doors 2003) alongside the 64-bit Power Mac G5 until June 2004. Once inventory cleared, Apple permanently closed the chapter on native Mac OS 9 hardware, requiring all subsequent Macintosh users to transition entirely to Mac OS X.