> > Set prescale somewhere around 3 to 5. It's a multiplier. Start with 3 and move it > > higher if you want it sharper. The higher the value, the more taxing it is on your > > graphics card so you can introduce lower performance this way (especially if you're > > using a lower end/integrated GPU). > > Even at prescale 5, the output is completely identical to before. > > Without any prescale > > With prescale 5
Try these settings in your mame.cfg and set the resolution to your monitor's maximum resolution: