Some weird thing with my Dreamcast Scart RGB cable.

[ckong]

I am trying to make it able to hook up my DC to an arcade cab, but my DC RGB cable confuses me.

When I look at the DC connector side of the cable, I see 9 pins connected (of the total of 16) (and ground of course, the shell):

1 - audio ground
2 - audio right
3 - audio left
7 - RGB out select
10 - composite sync
13 - Composite video
14 - Red
15 - Green
16 - Blue

In the scart plug I also see nine connections and ground, but none of them is composite sync. Instead I see that pin 16 in the scart connected (Fast ground). So I thought what the heck, I just cut loose the Scart Plug and I will do a circuit test on all the wires. So I did. Out of curiosity I opened the Scart shell and I saw some kind of circuit, which I ignored.

I made a couple of inches of wires free from the cable. And to my very surprise I see 5 unwrapped coloured wires, two coloured wires (red and white) wrapped in copper and the ground (shield of he cable). I unwrapped the white and red wire and ended up with  a total of 7 coloured wires and 3 copper wires.

During the circuit test I could trace back DC connector pin 1,2,3,7,13,14 and 15. But not 16 (Red)!!! and not 10 (Composite sync)!!! Instead, all three copper wires made during the circuit test connection with DC connector pin 10, 16 and Ground!!!!

What is going on? Why are ther 3 copper wires? How do I get just Red, C sync and ground each on a separate wire? I really don't understand and I hope someone can help me out here.

My main problem is the Red signal. I mean, I can get composite sinc from composite video if I run it through a cinc separator circuit, but what about Red?

[SailorSat]

Are you sure you're counting from the right side?

If not, you would have 16-15-14 (RGB), 10 (CSYNC), 4 (+12V), 3-2 (Audio Left/Right)

And the three common wires are Ground, 1 (Audio Ground) and 7 (RGB Select)

(The +12V are used for AV select, RGB mode and 4:3 aspect ratio)