> Who do you trust?
> 
> "6502 Software Design" by Leo J. Scanlon, and "68000
> Assembly Language Programming", by Kane, Hawkins and
> Leventhal, both published in 1981

I have Leventhal's two books on 6502 from the same period,
which I first used on the Commodore 64 and then later 6805
micros. They were university text books and had been vetted.
I still occassionally refer to the methodology. The assembly
listing of the C64 Kernel ("What's Really Inside The Commodore
64") was a great aid to understanding how a micro-based OS
works

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