Looking at the back panel of the Dreamcast, the pins are numbered from left to right.
Pin Description
1 Ground
2 Right Audio
3 Left Audio
4 +12v
5 +5v
6 selects horizontal scan: Grounded = 31KHz (VGA) Floating/disconnected = 15KHz (TV)
7 selects format: Grounded = RGB; Floating/disconnected = Composite/S-Video
8 Vertical Sync (for VGA)
9 Horizontal Sync (for VGA)
10 Composite Sync
11 S-video Chrominance (C)
12 S-video Luminance (Y)
13 Composite Video
14 Blue (Use 220uf cap)
15 Green (Use 220uf cap)
16 Red (use 220uf cap)

unknown connector
According to 3 reports in our database (2 positive and 0 negative) this pinout should be correct.

Is this pinout
Sega Dreamcast A/V visual pinout:
Sega Dreamcast A/V diagram
click to enlarge
Source(s) of this and additional information: Hardware Book, Marcus Hilbe, Marvin, mc.pp.se/dc/vgabox.html, http://www.gamesx.com/wiki/doku.php?id=av:dreamcastav
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