[Simh] [OT] What's the difference between the 1990 Brunner VAX Architecture book and the Leonard from 1987?

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Hi,

Since there are some ex-DEC people here and many people knowledgeable in
VAX can anybody tell me the [major] differences between these books if any?
The Brunner book is very expensive, the 1987 copy is very affordable. What
do I miss out on by buying the one by Timothy Leonard from 1987?

I realize the scans are up on bitsavers but I usually find real books
easier to deal with.

Thanks.

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