IT87_IEC
outb(inb(dev->cir_addr + IT87_IER) | IT87_RDAIE | IT87_RFOIE | IT87_IEC,
outb(inb(dev->cir_addr + IT87_IER) | IT87_TLDLIE | IT87_IEC,
~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE),
~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE)) | IT87_BR,