For Commodore, we had the Commodore Inner Space Anthology, put out by the wonderful people who published The Transactor magazine (http://csbruce.com/cbm/transactor/).
That book was amazing. The Atari Assembler cartridge and magazines completed the picture of what you could do with the Atari 8-bit. I know there was another book I loved, but I cannot remember its name. I have them in a storage garage along with my 400 and 130XE.
I had friends who had the Action language cartridge but I never got to play with that one. Apparently there was information there about the machines internals.
