i guess you'd discover that protocol by playing with a yaroze/caetla/etc with some of of device listening in between and recording the words?
never really got into using the parallel port as a cheap dio until building science rigs years later... (and some fun experiments with using it to do cheap adc when in college)
never really got into using the parallel port as a cheap dio until building science rigs years later... (and some fun experiments with using it to do cheap adc when in college)