Just came across this while reading old posts.

It would be very interesting to know how that is supposed to work. I wonder how he made the connections between the EEPROM socket and the key card circuit. Because if I look at the "X-Ray picture" of a key card, there is literally nothing in the corner of the manipulated key card. Looking at the key card from the back it doesn't look like it can be "opened" in any way, the circuit is completely sealed. Too bad Ryouta Nishikawa didn't answer in more detail or show a picture of the back of the card.

gepe.