billabs BL27CBOPU hooking up jamma to vga

[tcleary]

have this monitor hooked up to a pc, but I'm trying to hook up jamma to the vga connection.  jamma has composite sync, vga has horizontal and vertical, so I twisted the horizontal and vertical together and connected that to the composite on the jamma.  everything else should be stright forward, connected the grounds together and RGB to their respective jamma connection.  I used a vga breakout cable that was labeled so all the connections should be right.  but I get no picture, just a blank screen.

the monitor is getting something though because when nothing is connected it displays "disconnect" but when I turn on the jamma setup i get a blank screen. 

at this point I'm assuming it has something to do with the vga input on the monitor not liking composite sync?  not sure what else it could be.  I know the jamma board is getting power because it has a led.

so the next thing I am going to try is to use the other connector on the monitor, but I don't know what it is.  does anyone know where I could get a connector like this and the pins so I could wire it up to jamma?  it is a 6 pin connector below the vga, my camera is crappy at taking close up photos.

now that i think about it I think the cable was meant to go the other way, for example vga coming out of the pc into the breakout to the arcade monitor, combining horizontal and vertical into composite. 

what I'm doing is the opposite which I guess does not work!  so I have to use the other connector I think. 

[StephenH]

Yes, this monitor (assuming it supports 15Khz) can be connected to JAMMA.  Here is the pinout:


VGA Pin 1                -> JAMMA Pin 12       Video red    
VGA Pin 2                -> JAMMA Pin N        Video green   
VGA Pin 3                ->  JAMMA Pin 13      Video blue    
VGA Pins 6,7,8,10     ->  JAMMA Pin 14      Ground
VGA Pin 13              ->  JAMMA Pin P        Horizontal Sync
VGA Pin 14              ->  JAMMA Pin P        Vertical Sync

Note: Pins 4, 11, 12, and 15 (Monitor ID) as well as pin 9 (Key) do not need to be connected to the JAMMA harness or to the arcade gameboard.