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