Huh found the #6502assembler I first used to learn how to code. #C64 BASIC was so awful I did little with it. I can't remember where I got all the mnemonics and the rest though - snippets here and there I guess.
https://archive.org/details/1986-01-computegazette
"The Fast Assembler" from Compute! Gazette Issue 31, article on page 78, the data entry programme on page 124, and the assembler itself on pages 132 and 133!
Someone has even OCRd it!
https://github.com/xopowoparvo/C64-type-in-programs/tree/main/Programs/The%20Fast%20Assembler
15yo me was infinitely more patient.
Internet ArchiveCompute! Gazette Issue 31 : Free Download, Borrow, and Streaming : Internet ArchiveCompute! Gazette Volume 4 Number 1. The Commodore 64's Other Languages, A Buyer's Guide to Commodore 64 Languages, The Natural Approach to Computer Languages,...