Compaq 300 320 321 420 421 620 and 621 Notebook PC and 420 and 620 Notebook PC - Page 157
External monitor, Red analog, Blue analog, Not connected, Ground, 5 VDC, Monitor detect, DDC 2B data
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External 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 +5 VDC 10 Ground 11 Monitor detect 12 DDC 2B data 13 Horizontal sync 14 Vertical sync 15 DDC 2B clock External monitor 149
![](/manual_guide/products/compaq-300-320-321-420-421-620-621-notebook-pc-420-620-notebook-pc-64663cb/157.png)
External 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
+5 VDC
10
Ground
11
Monitor detect
12
DDC 2B data
13
Horizontal sync
14
Vertical sync
15
DDC 2B clock
External monitor
149