IDE drive connector

Connector: 40 Pin Header
IDE Hard Disk Interface IDC-40 Male

pin     assignment      pin     assignment
1       -Reset          2       GND
3       Data 7          4       Data 8
5       Data 6          6       Data 9
7       Data 5          8       Data 10
9       Data 4          10      Data 11
11      Data 3          12      Data 12
13      Data 2          14      Data 13
15      Data 1          16      Data 14
17      Data 0          18      Data 15
19      GND             20      Key
21      (reserved)      22      GND
23      -IOW            24      GND
25      -IOR            26      GND
27      IO Chrdy        28      Ale
29      (reserved)      30      GND
31      IRQ14           32      -IOCS16
33      Addr 1          34      (reserved)
35      Addr 0          36      Addr 2
37      -CS0 (1F0-1F7)  38      -CS1 (3f6-3f7)
39      -Active         40      GND 

Portables use a 44 pin IDE connector, which is the same as above plus:
41      +5V (logic)
42      +5V (motor)
43      GND
44      reserved

ESDI Hard Disk Interface
Command cable 
Connector:34 Pin Header
pin     assignment      pin     assignment
1       GND             2       Head Sel 3
3       GND             4       Head Sel 2
5       GND             6       Write Gate
7       GND             8       Config/Stat Data
9       GND             10      Transfer Ack
11      GND             12      Attn
13      GND             14      Head Sel 0
15      GND             16      Sect/Add MK Found
17      GND             18      Head Sel 1
19      GND             20      Index
21      GND             22      Ready
23      GND             24      Trans Req
25      GND             26      Drive Sel 1
27      GND             28      Drive Sel 2
29      GND             30      Drive Sel 3
31      GND             32      Read Gate
33      GND             34      Command Data

ESDI Hard Disk Interface
Data cable 
Connector:20 Pin Header
pin     assignment      pin     assignment
1       Drive Selected  2       Sect/Add MK Found
3       Seek Complete   4       Addr Mark Enable
5       (reserved)      6       GND
7       Write Clk+      8       Write Clk-
9       Cartridge Chng  10      Read Ref Clk+
11      Read Ref Clk-   12      GND
13      NRZ Write Data+ 14      NRZ Write Data-
15      GND             16      GND
17      NRZ Read Data+  18      NRZ Read Data-
19      GND             20      GND

RLL/MFM Hard Disk Interface
Command cable
Connector:34 Pin Header
pin     assignment      pin     assignment
1       GND             2       Head Sel 8
3       GND             4       Head Sel 4
5       GND             6       Write Gate
7       GND             8       Seek Complete
9       GND             10      Track 0
11      GND             12      Write Fault
13      GND             14      Head Sel 1
15      GND             16      (reserved)
17      GND             18      Head Sel 2
19      GND             20      Index
21      GND             22      Ready
23      GND             24      Step
25      GND             26      Drive Sel 1
27      GND             28      Drive Sel 2
29      GND             30      Drive Sel 3
31      GND             32      Drive Sel 4
33      GND             34      Direction In

RLL/MFM Hard Disk Interface

Data cable

Connector:20 pin Header

pin     assignment      pin     assignment
1       Drive Selected  2       GND
3       (reserved)      4       GND
5       (reserved)      6       GND
7       (reserved)      8       GND
9       (reserved)      10      (reserved)
11      GND             12      GND
13      Write Data+     14      Write Data-
15      GND             16      GND
17      Read Data+      18      NRZ Read Data-
19      GND             20      GND

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Page updated 98/07/14