why does my screen pan left/right with a hard turn on my spinner in MAME?

[Timoe]

When I play Tempest for example and I give a hard spin to the spinner, soetimes my screen jerks left or right.  This only happens in MAME.  Not in the FE or in Windows. 

Is there a setting that I am missing?

[screaming]

Are you using an LCD flatpanel?

[Havok]

You probably have the resoution set too high in Windows. Try dropping it down and see if the problem persists...

[MajorLag]

Maybe I'm missing something, but how could having his resolution too high cause this problem?

[steveh]

on a laptop when you set the resolution higher then the screen supports it will actually put a majorty of it off screen, and if you move your mouse to the left it will move the whole screen to the left, same with other directions.  Maybe it is something similar to this.

[Bobbler]

Sounds like screen tearing perhaps?
Set the Vertical Sync setting in your graphics cards driver or within your emulator.

[Timoe]

Its not a laptop and its not an LCD

Its my main cabinet and it uses a TV so the resolution is set to 640x480

and it only happens in mame.

any ideas?

[screaming]

what resolution is the game starting in? Are you specifying it in mame's mame.ini file or are you letting it auto detect?

[Timoe]

probably auto detect

[Xiaou2]

 Your card may be outputting 640*480... but Mame will often try to output a higher
resolution if its not properly limiting this.   

 So, when mame ups the res, and the card cant go any higher,  the card
interprets this and does the next best thing..   To keep the res at
640, and to make the screen lager than the actual physical display.

 This is how all the ATI cards function.  Not sure about others,
but i suspect the same.

 Usually its vector games in mame that do this..   because vector games
try to use the highest res possible.   Also, if artworks are turned on,
mame will also try to use higher resolutions.

 Finally, there is the possibility of external programs interferences...
such as mouseware programs that sometimes glitch. Try disabling them.

[screaming]

yup

[Timoe]

no mousewares.  But it is an ATI card.  how do I force 640 x 480?

[More Cowbell]

This has happened to me in the past too. Don't mess with the resolution until you look at the MAME properties for the game. In Display there is a choice called Zoom. It is probably set to 2 so set it to 1 and try it again. That has always worked for me in the past.

[Timoe]

well I set the resolution to 640x480 and it fixed it.  Is there a drawback to this method?

and where do I find the game properties?