American Megatrends Atlas III PCI User Manual page 38

Step 8 Attach IDE Drive,
Attach IDE Cable P5 is the primary IDE (Integrated Drive Electronics) hard disk drive
connector. Both the primary master and the primary slave IDE drives must be
connected by cable to P5, as shown below.
P5 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 WINBIOS Setup utility. Disable the
onboard IDE interface in Peripheral Setup to use an ISA ESDI, RLL, MFM, or
SCSI hard disk drive controller.
32 Atlas PCI-III PCI Pentium ISA Motherboard User's Guide
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