ESDI connector

#Computer#Harddisk interfaces

ESDI=Enhanced Small Device Interface.Developed by Maxtor in the early 1980´s as an upgrade and improvement to the ST506 design.

34 pin IDC MALE connector pin-out & layout

34 pin IDC MALE connector  at the controller (control connector)

Data connectors:

20 PIN IDC MALE (At the controller) 20 PIN IDC FEMALE (At the harddisk)

20 PIN IDC MALE at the Controller.

20 PIN IDC FEMALE at the Harddisk.

Control connector

PinNameDescription
2 Head Sel 3
4 Head Sel 2
6 Write Gate
8 Config/Stat Data
10 Transfer Acknowledge
12 Attention
14 Head Sel 0
16 Sect/Add MK Found
18 Head Sel 1
20 Index
22 Ready
24 Transfer Request
26 Drive Sel 1
28 Drive Sel 2
30 Drive Sel 3
32 Read Gate
34 Command Data

Note: All odd are GND, Ground.

Data connector

PinNameDescription
1 Drive Selected
2 Sect/Add MK Found
3 Seek Complete
4 Address Mark Enable
5 (reserved, for step mode)
6GNDGround
7 Write Clock+
8 Write Clock-
9 Cartridge Changed
10 Read Ref Clock+
11 Read Ref Clock-
12GNDGround
13 NRZ Write Data+
14 NRZ Write Data-
15GNDGround
16GNDGround
17 NRZ Read Data+
18 NRZ Read Data-
19GNDGround
20GNDGround

EIA530 (RS530) interface

IDE Internal connector