DAS1800_SELECT
outb(DAC(chan), dev->iobase + DAS1800_SELECT);
outb(DAC(update_chan), dev->iobase + DAS1800_SELECT);
outb(DAC(i), dev->iobase + DAS1800_SELECT);
outb(ADC, dev->iobase + DAS1800_SELECT);
outb(QRAM, dev->iobase + DAS1800_SELECT);
outb(ADC, dev->iobase + DAS1800_SELECT);