I've just tested my 3 TED2-wth-usb carts ... I'm very happy to say that they weren't DOA, but the results were mixed.
Core Grafx II Works
Super Grafx Works
Core Grafx II + SuperCDROM Fails
(using SuperCDROM power pass-trough)
Core Grafx II + SuperCDROM Fails
(using separate power supplies)
Super Grafx + SuperCDROM Works
(using separate power supplies)
I tried a few different combinations of my 2 Core Grafx II, 2 Super Grafx, and 2 SuperCDROMs.
After seeing the Core Grafx II + SuperCDROM fail, I was really quite surprised to see the Super Grafx + SuperCDROM work.
I'm really clutching-at-straws to come up with an explanation for this!
I know that there were 2 different versions of the HuC6280 CPU ... do we know which console variants used which versions of the CPU?
I didn't have time to try a System Card 3 image on the TED2 yet ... but I'm going to try that later, since it's pretty much my reason for buying the TED2.
BTW ... Has anyone else tried running the TED2 with a SuperCDROM yet?