DTFM Dial Tone generator. Apperantly each tone is just a sum of two sine waves. Cool!

You might be interested in this repo that converts asmtutor to Arm64. It's not the most faithful port though:

https://github.com/lirorc/arm-asm-examples

Just be shameless, that's how Terry Davis did it.

My blog is lirorc.github.io :)