/* Connections: (PDIP)
 *
 *  1: PB0      - Output RTTY
 *  2: PB1      - Enable Radio
 *  5: PB4      - To pin 1 of MMC card (/CS)
 *  6: PB5/MOSI - To pin 4 of ISP header
 *              - To pin 2 of MMC card
 *  7: PB6/MISO - To pin 1 of ISP header
 *                To pin 7 of MMC card
 *  8: PB7/SCK  - To pin 3 of ISP header
 *                To pin 5 of MMC card
 *  9: RESET    - To pin 5 of ISP header
 * 10: VCC      - 3.3v
 * 11: GND      - GND
 * 12: XTAL2    - 7.3728 MHz crystal
 * 13: XTAL1    - 7.3728 MHz crystal
 * 14: PD0/RXD0 - Input, UART camera
 * 15: PD1/TXD0 - Output, UART camera
 * 16: PD2/RXD1 - Input, GPS receiver
 * 17: PD3/TXD1 - Output, GPS receiver
 * 30: AVCC     - 3.3v
 * 31: GND      - GND
*/