Intel SG-81 - Manual (Page 22)

2-12 Chapter 2
2.3.10. IDE Disk Drive Connectors (IDE1, IDE2)
These IDE ports each connects up to two
IDE drives at Ultra ATA/100 mode by one
40-pin, 80-conductor, and 3-connector Ultra
ATA/66 ribbon cables. Connect the single
end (blue connector) at the longer length of
ribbon cable to the IDE port on system
board, and the other two ends (gray and
black connector) at the shorter length of the
ribbon cable to the connectors on hard
drives.
NOTE: The red line on the ribbon cable should be aligned with pin-1 on this
connector.
SG-80 Series