30 * Main - Connect to all ISSI Chips - Also break out header for debugging
35 * Reserve - Might be used later if I2C bus is too slow with more than 1 ISSI chip
40 * ISSI Control (enough pins for 3 chips reserved)
44 PTC2 - INTB Chip 3 (Only needed if more than 96 RGB LEDs are required)
46 PTA4 - SDB (tied to tall Chips, hardware shutdown)
60 * Comm - Will be used on split keyboards
70 * SWD - (Main reflash header)
77 PTA5 (LED only for PCB, not Teensy)
81 PTA1 - RX0 (UART Debug Header)
82 PTA2 - TX0 (UART Debug Header)