please help! - jerky mame with arcadevga - SOLVED!

[Jimbo]

I've tried quite a few games now (mame 0.116) and I'm getting a small jump/jerk/flicker every 1 or 2 seconds.

I've uploaded a short video of it . After the first wave of 2 or 3 baddies if you look at the bottom half of the screen (in the rocks) you can see what I mean (every 1 or 2 seconds).

My specs are: -

Asus P5B Motherboard
Intel Core2Duo 2.4ghz
2GB DDR2 RAM
ArcadeVGA2 PCI-E
SB-Audigy Sound Card.
WinXP SP2

Even with the jerking I've not noticed any stuttering of sound.

I'm using the following settings in mame 0.116: -

hwstretch 0
video ddraw
waitvsync 0
syncrefresh 1
triplebuffer 1
switchres 1

tried setting priority to 1 and sleep to 0, and also tried waitvsync 1 but it has no effect on the jittering...

Any ideas? Its a fresh clean system (just installed). I've tried stopping various non-essential services and systray apps but nothing seems to have any effect! Please help!

Thanks!

[northerngames]

screen resolution size?

[Jimbo]

Hi northerngames...

What exactly do you mean?  I'm running the games at their native resolutions (320 x 240 @ 60 Hz in the case of Rastan).  I'm using the AVGA card connected to an LCD currently, but will move to the arcade monitor in the cab once I've set up everything.  Am I missing something?

Thanks

[northerngames]

can a lcd even support a res size that small?

that is why a arcae moniotr is good becuase it can display low res images that vga and such cannot.

[Jimbo]

fixed it.

turns out the juddering was caused by me using a DVI to VGA adaptor when testing the AVGA card on my PC...  when I plug the VGA cable direct from card to arcade monitor its fine.

[northerngames]

yes the vga slot is 15k only and the dvi is actually the vga on these type cards