I think this one from Apple II is just recordings not synthesis<p><a href="https:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=9sptDXptWeM" rel="nofollow">https:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=9sptDXptWeM</a><p>Here&#x27;s one that might be synthesis<p><a href="https:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=Y3QV_2hq8qU" rel="nofollow">https:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=Y3QV_2hq8qU</a><p>Apple II was a 1mhz 6502 with a click speaker