SD card (regular non- sdhc with FAT tested and works ok, sdhc and FAT32 probably will work too) filenames and structure
SD card ROOT:
boot.bin (optional, if you want to load and run something)
boot.cfg (highly optional, if you want to load and run other file than boot.bin and not to default memory location)
bkramsv.bin (64kb, optional, if you want to backup your saturn internal saves to sdcard, may use bkram.bin from yabause, just rename it and SDload will overwrite it with your saturn saves)
bkramld.bin (64kb, optional, if you want to import saves from sdcard to your saturn, may use bkram.bin from Yabause, just rename it)
Update: included sample bkramsv.bin, bkramld.bin and boot.cfg in attachment to this topic.