ST-506/412 - HDD-Interface Connectors


ST-506/412 HDD-Interface - 34-Pin Control Bus Connector
(Used for (1983) classic - IBM XT/AT and PS/2 systems) 

Pin Signal Pin Signal
1 Ground 2 -HD SLCT 3
3 Ground 4 -HD SLCT 2
5 Ground 6 -Write Gate
7 Ground 8 -Seek Cmplt
9 Ground 10 -Track 0
11 Ground 12 -Write Fault
13 Ground 14 -HD SLCT 0
15 KEY (no pin) 16 not connected
17 Ground 18 -HD SLCT 1
19 Ground 20 -Index
21 Ground 22 -Ready
23 Ground 24 -Step
25 Ground 26 -DRV SLCT 0
27 Ground 28 -DRV SLCT 1
29 Ground 30 not connected
31 Ground 32 not connected
33 Ground 34 -Direction IN


ST-506/412 HDD-Interface - 20-Pin Data Connector

Pin Signal Pin Signal
1 -DRV SLCTD 2 Ground
3 not connected 4 Ground
5 not connected 6 Ground
7 not connected 8 Key (no pin)
9 not connected 10 not connected
11 Ground 12 Ground
13 +MFM Write 14 -MFM Write
15 Ground 16 Ground
17 +MFM Read 18 -MFM Read
19 Ground 20 Ground


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