Playing Mega CD/Sega CD games on the GSP.

[Lachlant1984]

Hi.  I have an Atari GSP with firmware version 1.30 on it and it works well, I've loaded 2600 games, GBA games and a solitary NES game onto the SD card and they work just fine.  I understand the GSP can play Mega CD and Sega CD games.  I understand you need to download the BIOS for the unit, which I've done and I can launch the BIOS .bin file, the attract/demo/start up screen comes up and I think the GSP understands that the bin file I've launched is a Mega CD BIOS, because I see some SCD.srm files on the memory card.  I've downloaded two Mega CD games from the Internet and unpacked them and put them on my memory card, they both have a .iso file extension, I understand the GSP needs .bin files.  Launching either the .cue or .iso file does nothing, I changed the .iso file to a .bin file, but that didn't work either.  These files are in the same folder as the BIOS files of course.  Am I using the wrong file format or something?  Do I need Mega CD game files that already have a .bin file extension?  Is there anything else I need to know before playing Mega CD tiles on the GSP?  Thanks everyone.