Has your system 3.0 Card ever worked before? Or did it just recently stop working. I happen to have a Turbo Duo myself (not a turbo 16 with CD expansion), but I do have an Arcade Card/HuCard that I have to push all the way in then slightly out to get it to work properly. I might recommend you buy an Arcade Card Pro, It supports regular CD, CD2, Super CD, and ACD and was designed specifically for the PC Engine. Your gonna have to fix the HuCard Slot/HuSlot PINS inside though, It's actually not that hard
http://www.geocities.com/duo_r@sbcgl...ch.install.txt. It took me about an hour. Or just buy a DUO which doesn't need a system card (it's internal). Hope this has been helpful.