Compaq 7020 - Manual (Page 22)

Technical Information
Pin Assignment - Analog D-sub connector
Pin Description
1 Red Video
2 Green Video/Sync on Green
3 Blue Video
4 Open
5 Return
6 Red GND
7 Green GND
8 Blue GND
9 +5V (for cable detect)
10 Sync GND
11 Open
12 Bidirectional DDC Data (SDA)
13 H. Sync.
14 V. Sync.
15 DDC Data Clock (SCL)
3-4 Compaq 7020 Flat Panel Monitor User’s Guide