Compaq d538 HP Compaq Business Desktop d500 Service Reference Guide, 5th Editi - Page 62
Legacy Mode, 4.6.2 Native Mode, Offset 1Ch-Secondary Control base address
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Serial and Parallel ATA Drive Guidelines and Features 4.6.1 Legacy Mode The Legacy mode is used to access devices attached to the embedded IDE controllers. Each channel requires two fixed I/O address ranges and an IRQ for each. ■ Primary Channel ❏ Command block: 1F0h - 1F7h ❏ Control block: 3F6h ❏ IRQ: 14 ■ Secondary Channel ❏ Command block: 170h - 177h ❏ Control block: 376h ❏ IRQ: 15 4.6.2 Native Mode The native mode is used to access devices attached to add-in cards and is not supported by many legacy operating systems. Addresses are assigned by PCI Plug-n-Play BIOS and the IRQ is shared with multiple controllers. Base Address Registers for the Command and Control Block are found in the PCI Configuration Space. ■ Offset 10h-Primary Command base address ■ Offset 14h-Primary Control base address ■ Offset 18h-Secondary Command base address ■ Offset 1Ch-Secondary Control base address 4-10 336492-005 Service Reference Guide, d500