Quite a few of these old games used the large laser disc players. There is some emulator software out there (free) that can play these on the PC.
I've found a great deal of info, one of the bigger challenges in finding, or restoring, these arcade games (if you go that route) is the monitors..they are RGB. They detail how to convert a tv to serve the function...pretty amazing stuff.
I found all the video clips of Dragon's Lair and condensed them into one four minute video
here I always wondered how to get around that dang black knight! Its 3mb and I used a lower quality to keep the size down (100mbit)