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The KeyLargo IC provides an Ultra DMA IDE (integrated drive electronics) channel that is connected to the internal hard disk 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-4, 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.