5 4 3 2 1
                 
\             /
\         /
         
9 8 7 6

Pin In/Out Signal Name
                        
1    na   Ground
2    na   Ground
3    O    Red
4    O    Green
5    O    Blue
6    O    Intensity
7    na   reserved
8    O    Horizontal Sync
9    I    Vertical Sync

See Also: CGA I/O Ports
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CGA Video Adaptor Pin Outs