System 12 - Default Contrast, R, G, B values?

[notsonic]

I have 5 system 12 boards and the contrast, r, g, and b values in the test menus are all different. As far as I can tell, there's no way to reset to a default value.

Is there a common default value across every game? What is it? I tried looking at manuals but that didn't get very far. Maybe I'll try mame.

 

[notsonic]

So I booted up the games I have irl in mame. Assuming there's no statefulness baked into the rom dumps, it would seem there is no standard setting across games.

Tekken 3:
C0 - Contrast
30 - Bright R
30 - Bright G
30 - Bright B

Tekken Tag Tournament:
A0 - Contrast
30 - Bright R
30 - Bright G
30 - Bright B

Mr. Driller:
A0 - Contrast
14 - Bright R
14 - Bright G
14 - Bright B

Ehrgeiz:
A0 - Contrast
20 - Bright R
20 - Bright G
20 - Bright B

Soul Calibur:
BC - Contrast
2C - Bright R
2C - Bright G
2C - Bright B

 

[Franco23444]

I went ahead and checked my only two arcade manuals for system 12 games, Tekken 3 and Soul Calibur. Supposedly, the default values for both games are

Contrast: A0
R: 18
G: 18
B: 18

The default values look terrible anyway lol.