PATHDocumentation > Hardware > Power Mac G4 Cube Developer Note

     

Ultra DMA Interface

In the Power Mac G4 Cube, the KeyLargo IC provides an Ultra DMA IDE (integrated drive electronics) channel that is connected to the internal hard disk drive and the CD-ROM or DVD-ROM drive. The KeyLargo IC provides DB-DMA (descriptor-based direct memory access) support for the Ultra DMA interface.

The Ultra DMA IDE interface, also called Ultra-DMA/66 and ATA-5, is an improved version of the EIDE interface.

The internal hard disk drive is connected as device 0 (master) in an ATA Device 0/1 configuration; the CD-ROM drive or DVD-ROM drive is an ATAPI drive and is connected as device 1 (slave).


© 2000 Apple Computer, Inc. (Last Updated 04 Oct 00)