The problem I had was with Fastram (I think). CD32-100 ran perfectly with it, but cd32-200 refused to even boot the menu (it would load the mouse pointer briefly, crash, try to boot again, crash, and so on). When I disable it, cd32-200 works fine.
Using NTSC cd32 with SX-1 with 8meg fastram and a 812meg harddrive. The only way I can disable fastram without opening the sx-1 case is to unplug it from the cd32 completely, but I'll admit that I have not tried pulling the ram stick out to see if it was the SX-1 itself.