The DPS cards are Time Base correctors. The clean up the video signal input into them and output it with a rock solid time base which the toaster requires. The DPS IV are among the best made. Now that analog SD video is going out of fashion, they are not worth so much these days but you will need at least one for working with the toaster. A lot of the the newer HD video equipment doesn't do that good a job of scaling the HD video to the composite out and I find that I need a TBC for most of my satellite and DVD video sources these days to get the the toaster to sync to it.
