Understanding how a demo works on the Commodore 64 (English)

I'm showing you a technique to disassemble and to understand how this brilliant 1k demo called Plasma190 works on the Commodore 64.
Plasma190
csdb.dk/release/?id=99766
Tool used: Regenerator
csdb.dk/release/?id=227254
Tool used: DirMaster
csdb.dk/release/?id=188658

[@4mat_music]

Hi. That's one of mine. :) Thanks for the doing a disassembly video. The first part of the code is making the charset, but it's also generating a sine table. That's the $9000 bit. It's been a few years but iirc I generate some of the table then store the same values forward and reverse and inverse them to make the other half.

[@Commodoreretro-programming]

Your code is just brilliant. I'm highly honoured that you passed by to provide us with your comments. Thank you so much! I tried to explain the presence of the two parts of the routine very roughly, and indeed I did not mention the creation of the sine table. I intended to do something more specific in another video. But would you consider commenting your code line by line? It would be interesting and useful for many "young" programmers like me. :)

[@4mat_music]

@@Commodoreretro-programming Thanks. Yes I can go through and explain it line by line. Looking at the disassembly there's a few places I can possibly shrink the size a bit more, where it's using the zero page incorrectly.

[@Commodoreretro-programming]

@@4mat_music That would be lovely. I'm sure lots of people would enjoy having the source code commented by its creator. Thanks.

[@benjamindeharo314]

@@4mat_music I second 4mat_music comment, I would love to see you commenting your code and I'm the only one.

[@4mat_music]

I've put a commented version of the source code on my Itch site (in the links on my channel) and made some optimised versions that I think look a bit better. Latest version is down to 118 bytes. Thanks for giving me the incentive to go back and try and improve it. :)

[@Commodoreretro-programming]

Thank you so much for this!

[@AzidHouse]

Yes! I was waiting for an english version!

[@MrGareth1973]

Thank you! Although I already watched your video with English subtitles, I am very grateful that you did it in English.

[@saganandroid4175]

Thanks for the English. Please make it louder if you can.

[@RalfBeckers]

Nice video! Love to see the whole flow :)

[@fizzbronson4279]

Thanks brah!

[@saganandroid4175]

6:13 You keep using this word, and I can't tell what it is. It sounds like Sauce but like Chaucier. CC says it's "Chet".

[@Commodoreretro-programming]

Charset 😊