AOpen DE896-FL Assembly Manual page 23

2. Stop Timer
outportb(0x2E,0x87);
outportb(0x2E,0x87);
outportb(0x2E,0x07);
outportb(0x2F,0x08);
outportb(0x2E,0xF6);
outportb(0x2F,byBit);
outportb(0x2E,0xAA);
outportb(0x2E,0x87);
outportb(0x2E,0x87);
outportb(0x2E,0x07);
outportb(0x2F ,0x08);
outportb(0x2E,0x30);
outportb(0x2F,byBit);
outportb(0x2E,0xAA);
outportb(0x2E,0x87);
outportb(0x2E,0x87);
outportb(0x2E,0x07);
outportb(0x2F,0x08);
outportb(0x2E,0xF7);
outportb(0x2F,byBit);
outportb(0x2E,0xAA);
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3. Set Min/Sec Mode
outportb(0x2E,0x87);
outportb(0x2E,0x87);
outportb(0x2E,0x07);
outportb(0x2F,0x08);
outportb(0x2E,0xF5);
outportb(0x2F,byBit);
outportb(0x2E,0xAA);
4. Start Timer
outportb(0x2E,0x87);
outportb(0x2E,0x87);
outportb(0x2E,0x07) ;
outportb(0x2F,0x08);
outportb(0x2E,0xF6);
outportb(0x2F,byBit);
outportb(0x2E,0xAA);