I want to use the Teensy++ 2 to run a chessboard with 64 LEDS and 64 reed switches. The centepede shield: http://docs.macetech.com/doku.php/centipede_shield
seems an ideal solution, especially as you can link two to address 128. it It uses the Wire I2C interface on analog pins 4 and 5 to provide 64 general purpose I/O pins. (x2) so I get massive addressing for only 2 pins with the added bonus that you connect using a ribbon cable and it has built in resistors.
It is designed to stack on a standard uno type board, however I want to use the Teensy because that can communicate using serial USB and keyboard at the same time.
So my question is, which pins represent the "Wire I2C interface on analog pins 4 and 5 " and can i just solder connections of two centipedes in a daisy chain arrangement?
Any other observations welcome.