I had an older student at my high school teach a machine language course, complete with a one page table of opcodes and their hex values so that we could type t

I had an older student at my high school teach a machine language course, complete with a one page table of opcodes and their hex values so that we could type them in. After that I purchased a copy of Programming the 6502 by Rodnay Zaks. Books took 3 months to arrive if they were a special order like that, sometimes longer. To this day it's still one of my favourite books.