I found out that the interrupt key produces a sad mac chime only if you press it after the startup chime, if you wait more that 6-10 seconds it does nothing

on the other hand, the reset button always works

I tried the same thing with the other board (the one with half video) and no matter when you press it (with no drives hooked up), it always makes a sad mac chime (that ends with 13, if I remember correctly)