How can i play Import games on my Multimega (CDX)

I think there was a cart made for the cdx, but i'm not sure, if not there should be a way to hack at the internals to make a switch.
the cdx carts only work with certain bios versions, so I wouldn't bet that they will work for the multimega.

as for the switch, there's no way other than replacing the actual bios eprom.