Although it’ll be the fifth book I read for learning My 6502 bit by bit, Leo J. Scanlon’s “6502 SOFTWARE DESIGN” arrived from eBay today.
The back is a little bent, but it is in better condition than most I saw on eBay, and the price was reasonable. It’s a first edition, third printing from 1980. I probably won’t be diving into this for six months (at least).