IDE Internal connector

#Computer#Harddisk interfaces

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 pin-out & layout

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 .
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.

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

ESDI connector

IEEE1284-B connector