Daryn, Very interesting link. Same thing could be done on M100 with one important improvement. you have the tone generator as well. So, you could use the technique in this video to interleave two voices, and mix in the third which comes from the tone generator.
Piezo may not be up to it though. Would have to look at that aspect, vs a speaker. I may try what's in this video, on the M100... On Wed, Apr 6, 2022 at 5:43 PM Daryn Hanright <[email protected]> wrote: > That's pretty cool. > > The USA guys might not be familiar with the original Sinclair ZX Spectrum, > but that had a 1 voice beeper, but musicians/coders did some amazing things > with it. This guy does a detailed analysis on what they did > > > https://hackaday.com/2022/01/20/when-a-single-bit-was-enough-into-the-sound-of-the-zx-spectrum/?fbclid=IwAR2-g9QsikuuFz2eGhmPVT-p1KhYFZuXLaivcnafhtW__O9Sie1qU9a5YbM > > > > On Thu, Apr 7, 2022, 9:27 AM Stephen Adolph <[email protected]> wrote: > >> When I have looked at the buzzer circuit circuit in the past, I was >> always wondering - could you drive 2 audio signals into the buzzer? >> >> >> There are 3 signals that drive the buzzer. >> >> Port BA pin 5 - direct drive >> Port BA pin 2 - on/off control for the "sound" tone >> Timer signal - tone generator >> >> So, you can make sound 3 ways >> 1) by enabling a single tone, enabling pin 2 and disabling pin 5 >> 2) by enabling a single tone, and modulating pin 2, and disabling pin 5 >> 3) by disabling single tone, disabling pin 2, and modulating pin 5. >> >> I ran a simple program to prove that you can generate extra sounds. >> >> 5 sound1000,1 >> 10 out186,233 >> 15 fori=1to1000:next >> 20 call30326:goto20 >> >> (hit reset to get back to normal!!) >> line 5 sets a tone >> line 10 turns on pin 2; you hear the tone >> line 15... some delay >> line 20 rapidly toggles the direct drive at pin 5. new sounds! >> >> you can distinctly hear the two separate sounds. >> In fact you can hear the timer interrupt as well, every second. >> you can also hear keyboard inputs >> >> so, this little test shows that you could separately set up a single >> tone, as well as driving modulated signal directly. that's 2 sounds >> >> A third sound could be mixed in by modulating pin 2 (turning the tone on >> and off). >> >> I don't know of any M100 software that has taken advantage of these extra >> ways to make sounds. Anyone else? >> >> Seems like an interesting area to explore. Some supporting machine code >> routines would be interesting to think about. >> >> need to think of a clever way to demonstrate 3 sounds mixed. >> >> Steve >> >>
