Arcade Collecting > Restorations & repair
CHICKEN RESTORE LIKE A ROBOT (Berzerk) *IT LIVES*
ChadTower:
So... I made my breakout cable based on this:
--- Quote from: http://www.mameworld.net/pc2jamma/pc_arc3.html ---
1 - Red
2 - Green
3 - Blue
4 - Monitor ID *
5 - Ground
6 - Red Ground
7 - Green Ground
8 - Blue Ground
9 - Keyway (No pin)
10 - Sync Ground
11 - Monitor ID *
12 - Monitor ID *
13 - Horizontal Sync
14 - Verical Sync
15 - Monitor ID *
You can ignore all the pins marked *, as we won't be using them. Don't forget to wire in all the grounds, wire the first one to Video Ground on the JAMMA fingerboard, then solder a short wire from this across to one of the Ground pins on the fingerboard. This just makes sure all your grounds are common.
As for getting composite sync from separate horizontal and vertical sync (which is what VGA puts out), you should run them through and XOR gate (7486) but I cheat - and just twist the wires together.
--- End quote ---
Now that I see it's not working for me, I think it may be that this JAMMA scheme isn't going to work for me in this case.
Looking at the monitor schematic I see this from the input connector:
My problem appears to be incorrect sync. The instructions I followed say to combine sync lines... but the monitor schematic has separate inputs for negative vert, negative hori, positive hori, and positive verti. Nothing for composite sync. What I have to do, I guess, is figure out which are coming from this video card and then make a new cable.
ChadTower:
Also, the joystick has a ton of play in it. Makes precise control difficult at times. It's a Wico 8 way... the fix for that is what, a new grommet?
SirPeale:
--- Quote from: ChadTower on September 27, 2008, 07:31:45 pm ---
Also, the joystick has a ton of play in it. Makes precise control difficult at times. It's a Wico 8 way... the fix for that is what, a new grommet?
--- End quote ---
Yes.
What monitor do you have again?
ChadTower:
--- Quote from: Peale on September 28, 2008, 11:36:37 am ---What monitor do you have again?
--- End quote ---
K7000, if I have it right from the chassic pic archive. 19".
ChadTower:
Here is a very useful page on troubleshooting VGA to RGB connection problems.
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