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Computer Connectors & Pinouts

AT power supply connector

Viewed from above motherboard.
Power good is 5v when power is ok.
1 Power Good Orange
2 +5v Red
3 +12v Yellow
4 -12v Blue
5 0v Black
6 0v Black
7 0v Black
8 0v Black
9 -5v White
10 +5v Red
11 +5v Red
12 +5v Red

Compaq Deskpro 386n power supply connector

Viewed from connector side of riser card.
Power good is 5v when power is ok.
1 -5v
2 -12v
3 +5v
4 +5v
5 +5v
6 +5v
7 0v
8 0v
9 0v
10 0v
11 0v
12 +12v
13 +5v
14 Power Good

AT Keyboard Connector

1 Keyboard Clock
2 Keyboard Data
3  
4 0v
5 +5v

PS/2 Keyboard Connector

1 Keyboard Data
2  
3 0v
4 +5v
5 Keyboard Clock
6  

PS/2 Mouse Connector

1 Mouse Data
2  
3 0v
4 +5v
5 Mouse Clock
6 0v

Monochrome Video Connector

1 Gnd
2 Gnd
6 Intensity Output
7 Video
8 Horizontal Sync
9 Vertical Sync

Colour Video Connector

1 Gnd
2 Gnd
3 Red Output
4 Green Output
5 Blue Output
6 Intensity Output
8 Horizontal Sync
9 Vertical Sync

VGA Connector

1 Red
2 Green
3 Blue
6 Red Gnd
7 Green Gnd
8 Blue Gnd
9 Reserved
10 Sync Gnd
11 Gnd
12 DDC Data
13 Horizontal Sync
14 Vertical Sync
15 DDC Clock

9-Pin Serial Port Connector

1 DCD
2 Rx
3 Tx
4 DTR
5 Signal Gnd
6 DSR
7 RTS
8 CTS

25-Pin Serial Port Connector

1 Frame Gnd
2 Tx
3 Rx
4 RTS
5 CTS
6 DSR
7 Signal Gnd
8 DCD
20 DTR

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