Did you test this out with 3Mbit and 6Mbit hu-card games? IIRC, they have an odd way of mapping their banks.
I'm really looking forward to ordering one of these. Any idea on shipping costs to Japan?
Take off yer flip flops and set up the tripod: it's bag kickin' time!
If you can give me any specific game titles, I can give them a try. It sounds like if there is an issue, that it could be addressed by an update of the PC software. There is enough flexibility in the existing communication protocol for placing a gap (or gaps) in where the rom code is located in the flash memory of the HuCard.
Adding PCE console specific layer on top of that, makes for an interesting challenge (no, not a reference to Ys II).
Would it be possible to use a flashcard as a Arcade Card on US systems?