7 offset 8 - dma channel/multiword dma type, 8 offset 9 - pio type, 1 bit 0 - fast pio – Western Digital T13/2132-D User Manual
Page 68: 2 bit 1 - fast dma, 3 bit 2 - ata read/write multiple, 4 bit 3 - chs translation, 5 bit 4 - lba translation, 6 bit 5 - removable media, 7 bit 6 - atapi device, 8 bit 7 - 32-bit transfer mode
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