Similar to the function of the keyboard combination of keys. The use of 51 single chip microcomputer. There are two independent buttons, when the two independent buttons are pressed, the buzzer issued a drop of sound after the stop. Until after the release of any key, the next combination of keys can be re trigger.

KEY\key
...\key.c
...\key.hex
...\key.lnp
...\key.LST
...\key.M51
...\key.OBJ
...\key.Opt
...\key.plg
...\key.Uv2
...\key_Uv2.Bak
...\STARTUP.A51
...\STARTUP.LST
...\STARTUP.OBJ
KEY

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