PATHHardware Documentation > PowerBook G3 Series 1999

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I/O Controller IC

The I/O controller IC is an ASIC called Paddington. The Paddington IC is an integrated I/O controller and DMA engine for use in Power Macintosh computers that have a PCI bus.

The Paddington IC contains the PCI bus arbiter. It also provides the interface and control signals for

• the video display subsystem
• the built-in modem
• the infrared link
• the Ethernet PHYTER IC
• the sound interface IC
• the internal EIDE hard drive
• a drive in the expansion bay
• the power manager IC

The Paddington IC is also used in the iMac computer and is similar to the Heathrow IC used in the Power Macintosh G3 computers and Macintosh PowerBook G3 computers. The main difference is that the Paddington IC supports 100Base-TX Ethernet as well as 10Base-T.