[Àû¿ë´ë»ó: DOSBox-x]

8254 timer clock frequency (NEC PC-98).

Depending on the CPU frequency the clock frequency is one of two common values.

If your setting is neither of the below the closest appropriate value will be chosen.

This setting affects the master clock rate that DOS applications must divide down from to program the timer at the correct rate, which affects timer interrupt, PC speaker, and the COM1 RS-232C serial port baud rate.

0 : Use default (auto)
8 : 1.996MHz (as if 8MHz or multiple there of
                    CPU clock)
10 : 2.457MHz (as if 5MHz/10MHz or multiple
                      thereof CPU clock)
