With no jumpers attached, the board shows parallel running lights. These mark the time until - if any buttons have been pressed - button presses are stored to EEPROM, and a game of Memory is started using the saved button presses.
If no buttons have been pressed, the timeout resets.
If jumpers connect Pin 0 and 1 on PORTA on reset, the board will try to load existing button presses stored in EEPROM, if any, and start playing Memory directly.
If a jumper connects Pin 2 and 2 on PORTA on reset, the board will play notes from the chromatic scale starting at an A of 441Hz.