case 1:
outportb(0x3f9,<u>0x0c</u>); //Put in divisor MSB <u>30h</u> 
outportb(0x3f8,0x00); //Put in divisor LSB 00h

case 2:
outportb(0x2f9,0x30); //Put in divisor MSB 30h 
outportb(0x2f8,0x00); //Put in divisor LSB 00h