Advice? Issue with Video display on Ultracade but only on some games

[nowears]

I just picked up an Ultracade Cabinet.  It works fine for most of the games but for some of them, once the game starts, the screen displays mostly wha tI would call horizontal partial lines.

The youtube video link is the best way to explain what it is doing, which is the game starts up, you can select a game, it goes into the instructions for the game controls but when it starts the main screen for the game itself, the screen is a bunch of moving partial horizontal lines.  This happens on some games, but not all.  I know that it happens with all of the Williams games like Defender, Joust, Mario Bros etc as well as the Golden Tee games.  There are other games as well, but many games work fine.
 
Here is the link of the video that I shot that shows the actual game doing it. 

[DaveMMR]

I know very little about Ultracade and monitors but I ran across this before:

http://www.udc.co.uk/support/ultracade/ultracade_sys_faq.pdf

Don't know if this pertains to your specific model but page 6 lists some various monitor issues.

Are you noticing this only happens with horizontal games? (The one that worked, Galaga, is a vertical game.)  It could be a resolution issue, I'm not entirely sure what type of monitor you have in there. (i.e. If it's a low res arcade monitor, it shouldn't be plugged directly into the VGA port but rather some dongle.)

[lilshawn]

depending on your monitor you need to have a resolution dongle installed to force some games to the proper resolution.

it's a plug that installs to the parallel port.

[nowears]

Thank you both for your help.  I would like to try this.  Can you tell me a good place to purchase a resolution dongle?
Thanks again,

[lilshawn]

i doubt you can buy them anymore. i think i have one someplace...not sure what resolution it is.

it's basically a bunch of jumper wires inside the shell, you can easily make one. If i find it i'll post what pins need to be jumped.

[nowears]

Too bad I can't get one somewhere, but if you can post what needs to be jumped, that would be outstanding.  I appreciate you even looking into it for me.

[lilshawn]

looks like for standard res you connect pins 11 and 19 together. all the rest stay open.

as a test you could just place a jumper wire into the 2 holes of the parallel port..if it works you can build a fancy looking dongle with a db25 and shell and everything...or leave the wire hanging outta there...whatever, we won't think any less of you