Speaking of Rainbow, I dumped the two PROMS and two PALS from one of the Rainbow's video boards (specifically, board "5015687 01" with the upd7220D-1 on it) rfka01 lent me.
These will be added to the driver shortly.
P.S. if you wore out the eprom socket, grab a soldering iron, a soldapult and some flux, and replace them; I suggest using dual wipe sockets from digikey, and to prevent this happening in the future, stack an extra socket on top of each one in the board, and use that extra socket when inserting/removing chips. (hence, if a socket fails, you can pull it out of the other socket, no desoldering needed)