Actually just switched to a different monitor and now its working fine. I also installed Mame 2003 plus, but not sure if that would have done anything. Apologies for wasting your time and thanks again.

Has anyone figured out how to use LEDspicer with MAME to automate which buttons are used per ROM? I have LEDspicer running but can not for the life of me figure this out.

@OneSwitch glad it worked for you too!

@GreenHawk84 - I think the vector code for mame2003 and mame2003-plus are pretty much identical now. One thing that has changed is instead of a vector resolution multiplier of 1, 2, 3, etc. it will be the actual render resolution under the Quick Menu -> Options settings. If one of the core resolutions match the native native resolution of your monitor it should like decent. If you can't match the resolution to the display exactly then shoot for something close. I find using an HD display (1920x1080) that 1440x1080 looks decent for both horizontal and vertical vector games. Try a vector beam width of 1 or 1.2 (Quick Menu -> Options) and if it still doesn't look satisfactory try turning on bi-linear filtering under Settings -> Video. Some of the options require a core restart, basically exit the game and restart it.

@hsamuels Same problem after update 1.7.5 - MAME 2003 (0.78) 95bb558 I'll open a new topic.

@RetroGamer99 said in My Asteroids-Themed DIY Upright Cabinet: This weekend or next will try setting up my arcade cabinet (mostly down to you motivating me). I'm flattered. 😳 Assuming maybe with the audio jack? Correct. 😀 With an adapter cable for the RCA jacks of the amplifier. Have fun with your project!