Thumpin_termis: I just checked out Hi-Leg Fantasy on the debugger and sure enough.... the game uses the SCD/DUO additional 192k. Well I'll be damned. I guess that makes sense, since the copyright date on the card's title screen is 1993.
So, this means the Supergrafx (not being a duo) isn't compatible with everything?
The SGX just became a little less leet. But only a little.
If you have a SGX+RAU adapter+Briefcase CD-ROM system, I suppose that means it won't be compatible with the GameExpress card.
However, SGX+SCD-Rom unit (the gray piggyback unit) should still be compatible with the GameExpress card, since the SCD-Rom, just like the Duo, has the SSC3.0 card 2Mbit memory built in.
So the basic answer is, the SGX
is still compatible with everything, as long as you have the right peripherals.