Friends, Has anyone experimented with generating and detecting tones on the cassette port other than the standard cassette mark and space frequencies?
The ROM code seems to generate the standard tones just by varying the timing loop iterations, and the detection is a slightly more complicated timing loop while watching/waiting for the signal to go from high to low, so it would *seem* to be the case that changing the values would let you use other audio frequencies in your own assembly code version of the cassette port code. (Basic isn't fast enough.) But...Has anyone actually written any assembly language code to do this? If so, could you send it to me? Douglas
