This is great! What a labor of love!

I've downloaded the PDF so I can take my time reading through it. Nothing more fun than grabbing a nice beverage and curling up with some well-explicated 6502 assembler code on a rainy day.

Back in the day I had a Tandy Color Computer. The 6809 CPU was amazing (and I learned assembler on it) but I lusted after the higher res and better colors of the C64.