My plan with Dragon's Lair is to run the game from a PC, using software known as Daphne (named for the princess in Dragon's Lair). Daphne emulates a number of arcade games that ran on laser discs.
My DL cabinet came with a 19 inch Electrohome G07 monitor. Unfortunately, an off the shelf PC cannot put out a 15 kHz RGB signal that an arcade monitor can display. Ultimately, I ended up swapping out the monitor for a new one. I ended up getting a 19 inch tri-res monitor:
The picture on this thing is great! It's a cool rig, since it can accept a VGA signal or traditional arcade signals. The screen was nice and bright, which made photographing it a bit of a challenge. In person, the screen images are fantastic.
I added in an Ipac (from Ultimarc) for interfacing the controls, and built a new harness for the joystick and buttons. The game plays great with the PC I was using for testing. I'm still ironing out a few kinks with the PC that will ultimately reside in this cabinet.