TAB books were virtually all garbage and apparently sold by the pound. I remember the (one of?) 6809 books had typos/mistakes in many of the source listings an

TAB books were virtually all garbage and apparently sold by the pound. I remember the (one of?) 6809 books had typos/mistakes in many of the source listings and schematics that even a novice could tell had issues. I had a friend spend a high school semester trying to get a Z80 thing running from a TAB book and finally had an electrical engineer friend of his dad look at the book and say "whoever wrote this doesn't know much about electronics...they apparently think TTL is the same as Legos". But on the up side...they were hardback and you got a pile of them for dirt.