Build Your Own Arcade Controls Forum

Main => Monitor/Video Forum => Topic started by: Jack Burton on October 17, 2012, 01:35:06 am

Title: Connecting arcade PCB's to presentation monitors.
Post by: Jack Burton on October 17, 2012, 01:35:06 am

So I have owned several "pro" level monitors for a while now, but I've never gotten around to connecting a real PCB to them.  I've been meaning to build a supergun with RGB inputs, but I have a couple of questions.

I have read that arcade pcb's will output a dim image to a non-arcade monitor if you do not install a particular resistor in the video signal line.  Is this also true for things like Sony PVM's, XM29's, or such? 

Also, I have been reading about this thing called a clamp circuit.  If it is present then seemingly the monitor can switch voltages and present the correct image. 

My Mitsubishi has this control on the back of it:

(http://i.imgur.com/YHIqP.jpg)

See that bit that says Mode B <> Mode A Clamp SW

Will one of those settings allow me to use a pcb without bothering to solder in resistors? 

Title: Re: Connecting arcade PCB's to presentation monitors.
Post by: newsdee on November 17, 2012, 09:59:17 am

If your PCB is JAMMA it will output RGB + Sync, which would go in the "H+V sync" connector.

It looks like that monitor has 75 Ohm resistors built in for RGB?
You might need one for the sync if it's too strong, though (you will know by the image jumping around)

Not sure about the Clamp input.
I have such a setting in an RGB+S -> VGA connector but not sure what it does, other than I need to find right values for it ("clamp SP and clamp ST")