Pin Description
1 Composite Video
2 Ground
3 Audio Mono
4 Green
5 +5VDC
6 Sync
7 Red
8 Blue

Pins 1 and 3 are swapped?
 

According to 8 reports in our database (7 positive and 0 negative) this pinout should be correct.

Is this pinout
Sega Genesis/Master A/V visual pinout:
Sega Genesis/Master A/V diagram
click to enlarge
Source(s) of this and additional information: SEGA Genesis A/V pinout at GamesXSegaDome, from Hardware Book, Jerry Lynds
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