PCE/Core Grafx/Core Grafx II/Super Grafx: no dice if stand alone. You need the Super CDROM peripheral for them if you want to use the System Card ROMs thru TurboED.
The other alternatives are the Duo/R/RX because they are a PCE + Super CDROM in one.
Again System Cards only affect CDROM games, so you need a CDROM player (the Super CDROM) to play them to begin with.
Keep in mind PCE CDROM games never had copy protection to start with, so if you already have a Super CDROM enabled console because it comes comes prewired with the System Card 3.0 , you really are only left out of the Arcade CDROM games. The Arcarde Card (the Duo version is all you need if starting from Super CDROM) has to be bought no matter what.
I don't think Krikzz is interested in making a TurboED "Arcade Edition" given the product although successful is not exactly flying off the shelves, at least that was the answer I got when I asked, and I can understand.
Also there are not too many Arcade CD ROM (called ACD) games:
http://www.slowdays.org/kaka/List_of_Arcade_Card_PC_Engine_GamesFor completeness there are some SCD games that do take marginal advantage of the Arcade Card if present:
http://www.slowdays.org/kaka/List_of_ACD-SCD_PC_Engine_GamesIf you want to dig deeper on PCEngine/PCFX I suggest:
http://www.pcenginefx.com/forumsCheck their System Cards version guide:
http://www.pcenginefx.com/forums/index.php?topic=8411.0PS: the PCE CD library is interesting and split into 3 main pieces CD, SCD, ACD and then Altered Beast.
Altered Beast requires SysCard 1.0 (will not work on anything else)
CD games need SysCard 1.0 or 2.0 and work fine on 3.0 and Arcade
SCD games need SysCard 3.0 (and the extra RAM it comes with) and work fine on Arcade.
ACD games require the Arcade Card (and the extra RAM it comes with)
This may help:
http://pcenginefx.com/main/nec_compatibility_guide.htmlPPS: Another nice touch is that PCE CDROM games had little easter egg if someone would try to play with wrong System Card. The game would show up a sometime very nice picture informing you that the wrong System Card was in use. Of course with Super CDROM peripheral or Duo/R/RX except ACD games it would be impossible to see such easter egg without TurboED ;-) but again it is slim picking. Nothing mind blowing.