I tried some of the other bios files (the github page says to choose just one) but they don't work, either. Now the screen only turns black for a quick moment before kicking me back to the list of games. and published by Konami Co., Ltd., this action game is available for free on this page. I put the keropi folder back in the bios directory. 1993, the year Castlevania Chronicles was released on Sharp X68000. I saw some other files had appeared, but I deleted them. This person had to put the BIOS files in the keropi directory in the roms section rather than the bios directory. The screen would just be black and the game wouldn't run. By the use of Sharp X68000 emulator, you can run all your best-loved games on your Android, iPhones, Mac or PC devices. At first, it would show the box prompting to press a button if I wished to configure the rom, then in the bottom lefthand corner tiny text that my Logitech controller was active. Originally released in 1987 with a 10MHz 68000 CPU and 1MB RAM, the series finished six years later with a 25MHz 68030, 4MB RAM and a 80MB HD. Released around the same time as the Amiga and Atari ST, it was leagues ahead of them both in terms of design and capability.

I found another rom to download, that of Chourensha (famous shmup for the system) and tried that. The Libretro core seems to loads the BIOS files from the location described in the Wiki (i.e the RetroArch System/BIOS folder setting). The X68000 is an unheard-of gem from Japan. You can use BLANKdiskX68000.D88 if you need to make a new FDD image (or for saves). I downloaded the BIOS files from an emulator wiki site and the roms came in a large zip file of pretty much every game for the X68k. Copy boot.rom and boot3.vhd to Games/X68000 folder.

Sharp x68000 bios download