This was an awesome resource for me, when I was looking up stuff.
http://pcenginefx.com/main/nec_compatibility_guide.html1: The PC Engine CD-ROM2 can play Super CD-ROM2 games if equipped with the Super System Card v3.0.
2: The PC Engine CD-ROM2 can play Arcade CD-ROM2 games if equipped with the Arcade Card PRO.
3: The PC Engine DUO consoles can play Arcade CD-ROM2 games if equipped with the Arcade Card DUO.
4: The PC Engine LT can play CD-ROM2, Super CD-ROM2 and Arcade CD-ROM2 games if equipped with a LT Super CD-ROM2 Adapter+Super CD-ROM2 unit and appropriate System card. The LT can also be used in conjunction with the PC Engine CD-ROM2 system/interface unit without an adapter.
5: The PC Engine CoreGrafx consoles can play CD-ROM2, Super CD-ROM2 and Arcade CD-ROM2 games if equipped with a Super CD-ROM2 unit and appropriate System card.
6: The PC Engine SuperGrafx can play CD-ROM2, Super CD-ROM2 and Arcade CD-ROM2 games if equipped with a Super CD-ROM2 unit and appropriate System card. The SuperGrafx can also attach to the PC Engine CD-ROM2 unit using the RAU-30 adapter.
7: The Pioneer LaserActive+PAC-N10 can play Arcade CD-ROM2 games if equipped with a Arcade Card DUO and HuCard converter (converter needed for US model only).