ST506/412 pinout

connector wiring scheme

34 pin IDC male connector
at the controller

The first drives used an encoding method called MFM (Modified Frequency Modulation). Later a new encoding method was developed, RLL (Run Length Limited). RLL had the advantage that it was possible to store 50% more with it. But it required better drives. This is almost never an problem. Often called 2,7 RLL because the recording scheme involves patterns with no more than 7 successive zeros and no less than two.

Second connector: 20 PIN IDC MALE at the Controller.

20 PIN IDC FEMALE at the Harddisk.

Control connector

Pin	Name	Description
2		Head Sel 8
4		Head Sel 4
6		Write Gate
8		Seek Complete
10		Track 0
12		Write Fault
14		Head Sel 1
16	RES	(reserved)
18		Head Sel 2
20		Index
22		Ready
24		Step
26		Drive Sel 1
28		Drive Sel 2
30		Drive Sel 3
32		Drive Sel 4
34		Direction In

Note: All odd pins are GND, Ground.

Data connector

Pin	Name	Description
1		Drive Selected
2	GND	Ground
3	RES	(reserved)
4	GND	Ground
5	RES	(reserved)
6	GND	Ground
7	RES	(reserved)
8	GND	Ground
9	RES	(reserved)
10	RES	(reserved)
11	GND	Ground
12	GND	Ground
13		Write Data+
14		Write Data-
15	GND	Ground
16	GND	Ground
17		Read Data+
18		Read Data-
19	GND	Ground
20	GND	Ground

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34 pin IDC female connector
at the harddisk

Pinouts.ru > Hard drives connectors pinouts listing > Pinout of ST506/412 and layout of 34 pin IDC male connector and 34 pin IDC female connector	Document status:	unknown
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