REICAST for Android info:

Put 2 bios files on reicast "home directory" (you can change that dir on Reicast settings) like so:
REICAST HOME\data\dc_boot.bin
REICAST HOME\data\dc_flash.bin

Also on reicast you will see "Dreamcast BIOS" TEXT if you tap it, it will boot the bios OR 
it will tell you where to put this data folder.

That should be enough for everyone to get Reicast going. if not contact me.