An earphone plug for receiving sound signals, having a first headphone cord connected to the earphone plug having a first length and a second headphone cord connected to the earphone plug having a second length is provided. The processor includes a protected execution unit, a check unit to detect errors in results generated by the protected execution unit, and a replay unit to track selected instructions issued to the protected execution unit. The quick-release collet then releases the used electrode chuck. The microcode ROMs may collectively store the microcode routines that implement the microcoded instructions of a complex instruction set, and different microcode ROMs may have different access times.