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J20 IDE Connector
J20 is used to connect a hard disk drive with an Integrated Drive Electronics Interface. The interface is 100% compatible with the IBM AT Hard Disk Controller.
The IDE interface can be disabled via Setup. You must disable the onboard IDE interface to use an ISA bus ESDI, RLL, SCSI, or MFM hard disk controller.
Pin
Use
Pin
1
-RESET
2
3
DATA7
4
5
DATA6
6
7
DATA5
8
9
DATA4
10
11
DATA3
12
13
DATA2
14
15
DATA1
16
17
DATA0
18
19
GND
20
21
N/C
22
23
-IOW
24
25
-IOR
26
27
N/C
28
29
N/C
30
31
INT14
32
33
HA1
34
35
HA0
36
37
-CS0
38
39
-IDEACT
40
Use
GND
DATA8
DATA9
DATA10
DATA11
DATA12
DATA13
DATA14
DATA15
KEY (N/C)
GND
GND
GND
ALE
GND
-IOCS16
N/C
HA2
-CS1
GND
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