predcon: There's a fellow that runs an off-YouTube web show called "Ancient DOS Games" or ADG for short. It's a sort of review/expose/documentary/nostalgia retrospective showcase program. He rarely ever covers a whole game series in one episode, but one such series is the Catacomb 3-D series (link to episode; the original freeware 'Catacomb' episode can be found here). In every episode of ADG, the host lays out the most optimized DOSBox settings available for the game, so it's especially useful for those of you who've already bought the game from GOG.com, and are having some trouble running it. And do check out the other episodes, whether you're having issues with the games or not.