'Sample Metrabus program for the MAO-12 Analog Output Board. This example
'shows how to set up a simple output of a DAC. Please remember that when
'you address a register, that you must also perform a write or read.
'Therefore, each OUT ADRPTR must be followed by a OUT DATAIO or INP
'command.


dataio = &H360                  'Sets Base address to 768
adrptr = dataio + 1             'Sets Address Pointer to 769
mao12 = 16                      'Sets board address of MAO to 16
hibyte = 128                    'Sets hibyte to 128
lowbyte = 128                   'Sets lobyte to 128


' point to the channel to update
OUT adrptr, mao12 + 2           'Set Addr Pointer to select channel
OUT dataio, 0                   'Select first channel (Logical 0)


' set the high byte value
OUT adrptr, mao12               'Set Addr Pointer to write hibyte
OUT dataio, 255                 'Write out hibyte value

'set the low byte value
OUT adrptr, mao12 + 1           'Set Addr Pointer to write lobyte
OUT dataio, 255                 'Write out lobyte value

' point to the channel to update
OUT adrptr, mao12 + 3           'Set Addr Pointer to update DAC
OUT dataio, 1                   'Write out a 1 to update DAC 0


'*** This is where some confusion may lie. Not only must you point
'*** to the address to trigger a channel, but you also have to do
'*** a write of some dummy value.

'  Update the channel
           
OUT adrptr, mao12 + 4           'Set Addr Pointer to trigger DACs
OUT dataio, 0                   'Write out a 0 to trigger DAC's