Sega CD ROMS Fail to Load

Metal Ghost

Hello, and thanks in advance for any & all help. It is very much appreciated!

I have searched the forums for some insights into what may be happening here, but with no luck so far. I hope that this post will be following the guidelines as set forth in Read This First post. If I miss anything, please just let me know.

I am Running RetroPie Version 4.6 (rpi4 - running on Raspbian GNU/Linus 10 (buster)) on a Raspberry Pi 4 Model B with 8GB memory. I am using the CanaKit 3.5A USB-C Power Supply with Noise Filter (UL Listed)that I purchased with my Pi. I flashed the image myself a couple of weeks ago from the RetroPie website. Since then I haven't really tinkered at all with anything that I can think of.

Situation: Sega CD is listed from menu as available. My games will appear within the Sega CD submenu. When I click on a game, it will throw up the "Launching XYZ Game (lr-genesis-plus-gx)..." menu, and then go back to the Sega CD submenu and list of games.

I have loaded the us_scd1_9210.bin BIOS file into the BIOS folder. I have also tested by additionally loading the BIOS file into the ROM folder as well, with the same results. I have used a BIOS sourced from two places, again with the same result. I don't know how to check the MD5Sum but if someone tells me how to I'd be happy to check what it is for this BIOS file.

Additionally, I have tested with 3 separate games, again all with the same results described above.

mitu

@Metal-Ghost said in Sega CD ROMS Fail to Load:

Situation: Sega CD is listed from menu as available. My games will appear within the Sega CD submenu. When I click on a game, it will throw up the "Launching XYZ Game (lr-genesis-plus-gx)..." menu, and then go back to the Sega CD submenu and list of games.

The BIOS files for lr-genesis-plus-gx are named differently - see https://retropie.org.uk/docs/Sega-CD/. Either switch to lr-picodrive or add the correct BIOS files.

If you're on Windows, then you can use Certutil to generate a MD5 hash, for Linux (including RetroPie) see here.

lostless

@Metal-Ghost you can just duplicate the bios file and rename it for genesis plus gx. Then you’ll have a bios for both picodrive and genesis plus gx

Clyde

@lostless said in Sega CD ROMS Fail to Load:

@Metal-Ghost you can just duplicate the bios file and rename it for genesis plus gx. Then you’ll have a bios for both picodrive and genesis plus gx

Or you can do this in RetroPie:

Press F4 in Emulation Station to get to the command shell.
Enter cd RetroPie/BIOS/ to go to the BIOS directory.
Copy the BIOS file to another with the correct name for lr-genesis-plus-gx with the command cp us_scd1_9210.bin bios_CD_U.bin. (Mind the capitalization, as Linux does, too.)

Or even quicker but more write-intensive, do 2. and 3. in one command:

cp RetroPie/BIOS/us_scd1_9210.bin RetroPie/BIOS/bios_CD_U.bin

Return to Emulation Station with exit.

Metal Ghost

@mitu , @lostless & @Clyde - You all are great. I swear I looked at the Sega CD Docs at least a dozen times, and my eyes just completely glossed over the order of the emulators/BIOS instructions. ROMS loading now without any issue.

Thanks again!!