Hm. I actually sold him my SGX -- don't recall him actually modding it though. I actually recall him being a bit adverse to the idea of modding it. But perhaps he did. Not sure.
Anyway, I *think* I got that info from D-Lite's website, which is certainly a reputable source -- it's just that I can't verify 100% if my memory is accurate.
Though again, I can't see the logical reason why this would happen to a region modded supergrafx
IF you put in enough switches so electronic schematic wise, you can technically have it running [/i]exactly[/i] the same as if the system was unmodded while it's running in Japanese region mode. There's no way the system can verify that it's modded as long as you put in a switch for the GND/+5v switch on the region lockout pin.