IDE=Integrated Drive Electronics.Developed by Compaq and Western Digital. Newer version of IDE goes under the name ATA=AT bus Attachment.
40 pin IDC MALE connector at the controller & peripherals
Often, the control circuitry is built into the motherboard, eliminating the requirement for a separate Host Adapter.
There are 2 types of IDE interfaces...those for the 8-bit XT bus, and those for the 16-bit AT bus .
40 pin IDC FEMALE connector at the peripherals
Note: Direction is Controller relative Devices (Harddisks)