DAT Type: Clrmame Pro
It's pretty easy to generate alot DATs in a row, that's why I prefer TIM for DAT creation more than clrmame.
The Feature of adding entries to the existing TIM.db is kinda bugged, I tried it once to make a db for it with the latest DATs but gotit all screwed up.
Here's an example as attachment. (remember that your files need to be zipped before creating the DAT)