altera fpga development board 1.1 PWM control buzzer 2.4 user LED 3.An adjustable resistor AD0 ... .1 protocol) * Standard audio input and output interfaces * 1 PWM control buzzer * 4 user LED * An adjustable resistor AD0, 1, for ... user buttons, WinCE or Linux can be defined as in up, down, left, right, TAB, Enter key, 6 keys can lead to ...