Compaq Presario 1246 Maintenance & Service Manual page 27

"Compaq.com - Compaq Presario Series Maintenance and Service Guide - Models: 1246, 1277, 1278, and 1279
Connector
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External VGA Monitor
Pin Signal
1 Red Analog
2 Green Analog
3 Blue Analog
4 Not connected
5 Ground
6 Ground Analog
7 Ground Analog
8 Ground Analog
9 Not connected
10 Ground
11 Monitor Detect
12 DDC2B Data
1 Data 1
2 Data 2
3 Ground
4 +5 V
5 Clock 1
6 Clock 2