#define PCI9111_REGISTER_AD_FIFO_VALUE                 0x00 /* AD Data stored
                                                                in FIFO */
-#define PCI9111_REGISTER_DA_OUTPUT                     0x00
+#define PCI9111_AO_REG                                 0x00
 #define PCI9111_DIO_REG                                        0x02
 #define PCI9111_REGISTER_EXTENDED_IO_PORTS             0x04
 #define PCI9111_REGISTER_AD_CHANNEL_CONTROL            0x06 /* Channel
                &PCI9111_HR_AI_RESOLUTION_MASK) \
                        ^ PCI9111_HR_AI_RESOLUTION_2_CMP_BIT)
 
-#define pci9111_ao_set_data(data) \
-       outw(data&PCI9111_AO_RESOLUTION_MASK, \
-               dev->iobase + PCI9111_REGISTER_DA_OUTPUT)
-
-
 static const struct comedi_lrange pci9111_hr_ai_range = {
        5,
        {
        int i;
 
        for (i = 0; i < insn->n; i++) {
-               pci9111_ao_set_data(data[i]);
+               outw(data[i] & PCI9111_AO_RESOLUTION_MASK,
+                       dev->iobase + PCI9111_AO_REG);
                dev_private->ao_readback = data[i];
        }