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40 pin IDC male connector layout
40 pin IDC male connector
at the controller & peripherals
40 pin IDC female connector layout
40 pin IDC female connector
at the peripherals
IDE=Integrated Drive Electronics.Developed by Compaq and Western Digital. Newer version of IDE goes under the name ATA=AT bus Attachment.

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 .
The cable for IDE contains 40 conductors and has no twists. Like an SCSI cable, the IDE cable uses a Dual-row Pin connector for both ends. A single cable may be used to connect two drives, or two cables may be Daisy-Chained.
Most IDE Host Adapters will support two hard drives. The first drive should be jumpered as the Master drive, and the second as the Slave drive. Plug-in IDE Host Adapters are often called Paddle-Boards, and may contain a floppy controller, and serial and parallel ports.

Pin Name Dir Description
1 /RESET --> Reset
2 GND --- Ground
3 DD7 <-> Data 7
4 DD8 <-> Data 8
5 DD6 <-> Data 6
6 DD9 <-> Data 9
7 DD5 <-> Data 5
8 DD10 <-> Data 10
9 DD4 <-> Data 4
10 DD11 <-> Data 11
11 DD3 <-> Data 3
12 DD12 <-> Data 12
13 DD2 <-> Data 2
14 DD13 <-> Data 13
15 DD1 <-> Data 1
16 DD14 <-> Data 14
17 DD0 <-> Data 0
18 DD15 <-> Data 15
19 GND --- Ground
20 KEY - Key
21 n/c - Not connected
22 GND --- Ground
23 /IOW --> Write Strobe
24 GND --- Ground
25 /IOR --> Read Strobe
26 GND --- Ground
27 IO_CH_RDY <--  input/ output channel ready
28 ALE --> Address Latch Enable
29 n/c - Not connected
30 GND --- Ground
31 IRQR <-- Interrupt Request
32 /IOCS16 ? IO ChipSelect 16
33 DA1 --> Address 1
34 n/c - Not connected
35 DA0 --> Address 0
36 DA2 --> Address 2
37 /IDE_CS0 --> (1F0-1F7)
38 /IDE_CS1 --> (3F6-3F7)
39 /ACTIVE --> Led driver
40 GND --- Ground
Note: Direction is Controller relative Devices (Harddisks)
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