Hello, I´m install RETROARCH new release (4r18) and MEGA CD games not working. When I selected a game, the emulator show a black screen and return to previous.
Please forgive me, my English is to bad lol.
Congratulations for best work in the google play.
Help me!! thanks 
I haven’t used Picodrive and I don’t have an Android device to even try it on, but it sounds like you forgot to collect one or more Mega-CD BIOS files, which are needed to run games. Check the RetroArch Manual, it should tell you where to put the files.
I did just that, but in the manual there is nothing concerning PicoDrive.
Concerning the BIOS as I have asked GENSPLUS the GX, and MegaCD works perfectly but no sound CD AUDIO TRACK.
When I saw the new release thought PicoDrive TRACK bear the sound, but it seems that does not yet support MegaCD.
I can not wait for it to be so, since I have a few games left that I will not play without being able to enjoy them in all their extension.
Sorry to drag up this thread but that link doesnt seem to work anymore…
I’m also having an issue with Mega CD music not playing - viewtopic.php?f=2&t=1053