Windows NT for Power Macintosh This repository currently contains the source code for the ARC firmware and its loader, targeting New World Power Macintosh systems using the Gossamer architecture (that is, MPC106 "Grackle" memory controller and PCI host, and "Heathrow" or "Paddington" super-I/O chip on the PCI bus). That is, the following systems: iMac G3 (tray-loading) Power Macintosh G3 (Blue & White) "Yosemite" Macintosh PowerBook G3 Bronze Keyboard "Lombard" Power Macintosh G4 PCI "Yikes!" Th...