# ATA Internal

ATA=AT bus Attachment..
Developed by Western Digital, Conner & Seagate ?.

(At the controller & peripherals)
(At the cable)

40 PIN IDC MALE at the controller & peripherals.
40 PIN IDC FEMALE at the cable.

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 (Pin missing)
21 | DMARQ | ? | DMA Request
22 | GND |  | Ground
23 | /DIOW |  | Write Strobe
24 | GND |  | Ground
25 | /DIOR |  | Read Strobe
26 | GND |  | Ground
27 | IORDY |  | I/O Ready
28 | SPSYNC:CSEL | ? | Spindle Sync or Cable Select
29 | /DMACK | ? | DMA Acknowledge
30 | GND |  | Ground
31 | INTRQ |  | Interrupt Request
32 | /IOCS16 | ? | IO ChipSelect 16
33 | DA1 |  | Address 1
34 | PDIAG | ? | Passed Diagnositcs
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