The Power Mac G4 is a series of personal computers designed, manufactured, and sold by Apple Computer from 1999 to 2004 as part of the Power Macintosh line. Built around the PowerPC G4 series of microprocessors, the Power Mac G4 was marketed by Apple as the first "personal supercomputers", reaching speeds of 4 to 20 gigaFLOPS. This was the first existing Macintosh product to be officially shortened as "Mac", and is the last Mac able to boot into classic Mac OS.
A "Graphite" Power Mac G4.
Rear view of a "Graphite" Power Mac G4, showing the available ports, including firewire, USB, and ethernet
Power Mac G4 (QuickSilver)
IEEE 1394 is an interface standard for a serial bus for high-speed communications and isochronous real-time data transfer. It was developed in the late 1980s and early 1990s by Apple in cooperation with a number of companies, primarily Sony and Panasonic. It is most commonly known by the name FireWire (Apple), though other brand names exist such as i.LINK (Sony), and Lynx.
A 9-pin FireWire 800 connector
4-conductor (left) and 6-conductor (right) FireWire 400 alpha connectors
A PCI expansion card that contains four FireWire 400 connectors.
FireWire 800 port (center)