Rgb question

[vsl]

Hello,
is there any hardware device that can standardize or equalize the RGB output signals from arcade boards? Different boards seem to generate slightly different timings, which causes the picture to shift left or right, or appear stretched on the display. I’m looking for a solution that can correct or stabilize the sync/geometry so the image remains properly aligned regardless of the board used.

 

[thegreathopper]

I don’t think so.

 

[vsl]

Maybe something like this : Extron RGB 103 ?

 

[John Bennett]

I think you'd have to resample and rescale the whole thing to do that, which'll be a bit ugly on a 15kHz CRT (and potentially add lag).

The horizontal pixel clock varies a lot with games as there's a lot of different horizontal resolutions out there (e.g. Smash TV is a LOT higher than Robocop). The operator was epected to adjust the dials to fill the screen and get the aspect ratio 4:3.

Vertically they varied less as it's constrained by the 15kHz clock, but some pushed a few more lines in there by eating into the overscan/blanking region.

 

[SquidDude]

An extron interface would let you adjust the image H phase easily (and V phase on some models), the sync processing may help, but I doubt it'd magically make every board centered.
I'd say get one to try if you can, they're usually pretty cheap on ebay (I think I got mine for £20) and generally just good to have around.

 

[Bods]

Don't know if it works for all games but I found if you have a few say Taito pcbs they were generally similar and didn't need altering, stick in a Konami and it needs loads altering as you say

I've fitted Remote boards for the monitor in most of my cabs if I'm going to play different pcbs in to make it easier