The card is very simple to use as can be seen from the next procedure which takes a number of samples:
verbatim2#
This procedure accomplishes a sample frequency of about 440 kHz (the AD7569 datasheets guarantee the maximum sampling frequency to be between 385 and 625 KHz with the internal clock, and at least 500 kHz with an external clock). In still faster systems or machinecode routines one can test bit 0 of port $300 to check for conversion completion. During conversion this bit is 1, upon completion it becomes 0.
A procedure to copy the ADC input to the DAC is:
verbatim3#