Dreamcast ISOs?

are they actually .iso files? that would be a godsend, since every method and program i've tried for burning .cdi images hasn't worked.

It's a mix, some are bin and cue files, some are ISOs, but there are quite a few CDI images.

ok, bin and cue files should be fine too, thanks! is there any way of knowing without downloading first?

Just to add something here, are the files self-booting if they were to be played on a regular Dreamcast or is a boot disc needed?

self booting providing they are the correct region.