American Megatrends Atlas PCI-II User Manual page 34

Step 10 Attach IDE Drive,
Attach IDE Cable The primary IDE (Integrated Drive Electronics) hard disk drive connector
is marked PRIMARY. Both the primary master and the primary slave IDE
drives must be connected by cable to PRIMARY, as shown below.
PRIMARY is a 40-pin dual-inline berg that connects an IDE drive to the
primary onboard IDE connector. This motherboard supports IDE Modes 0, 1,
2, 3, and 4, IDE prefetch, LBA (Logical Block Address) mode, high capacity
drives (over 528 MB), 32-bit data transfer, and fast IDE transfer. These IDE
features are configured in Peripheral Setup in the AMIBIOS Setup utility.
Disable the onboard IDE interface in Peripheral Setup to use an ISA ESDI,
RLL, MFM, or SCSI hard disk drive controller.
30 Atlantis PCI Pentium II ISA Motherboard User's Guide
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