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  1. ATA/ATAPI
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80 Wire IDE Connector Information:

IDE Hard Disk * 40 pin / 80 wire header

The following explanation provided to us from George Walker, BuildOrBuy Member.

1 reset   2 ground
On the 80 wire connectors, the following pins measured as common: 2, 19, 22, 24, 26, 30, and 40 (Motherboard, Gray and Black).

On the connector that connects to the Motherboard pin # 34 does not connect to the ribbon cable but is connected to common. Some cables have a hole in the cable as a way of disconnecting pin # 34 from the other two connectors.

On the middle (Gray) connector pin #28 is not connected to the ribbon cable. (C/S Slave).

The extra 40 wires, one of which is inserted between each data wire, are all connected in common and are connected with 2, 19, 22 etc. on each connector.

On most IDE connectors on Hard drives and CD-ROM Drives, Pin 20 is missing.
3 data 7 4 data 8
5 data 6 6 data 9
7 data 5 8 data 10
9 data 4 10 data 12
11 data 3 12 data 13
13 data 2 14 data 14
15 data 1 16 data 15
17 data 0 18 n/c
19 ground 20 ground
21 n\c 22 ground
23 iow 24 ground
25 ior 26 bale
27 n\c 28 ground
29 n\c 30 n\c
31 idint 32 n\c
33 sa1 34 n\c
35 sa0 36 sa2
37 cs5 38 hcs1
39 n\c 40 n\c
  1. www.pcguide.com/ref/hdd/if/ide/conf_Cable80.htm
  2. images/bullet2.gifPlextor University - 80-Conductor ULTRA ATA Cable: 80 Wire / 40 Pin

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Web Development, Gill Boyd & Team - Posted 07/29/2001; Updated 09/25/2002