Step 9 Attach IDE Drive, Continued
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 WINBIOS Setup utility. Disable the onboard IDE interface in Peripheral Setup to use an ISA ESDI, RLL, MFM, or SCSI hard disk drive controller.
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36Apollo IV PCI Pentium ISA Motherboard User’s Guide