REG_INTERRUPT
reg = inb(iobase + REG_INTERRUPT);
outb(0x04, iobase + REG_INTERRUPT);
outb(0x08, iobase + REG_INTERRUPT);
outb(0x01, iobase + REG_INTERRUPT);
outb(0x02, iobase + REG_INTERRUPT);
outb(0xff, iobase + REG_INTERRUPT);