Do you happen to have specifications of the bytecodes, primitives and object memory format compared to the Blue Book? I only have a plethora of (outdated) papers and presentations, nothing systematical.
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The best documentation is inside Squeak itself, specially very early ones. In later version the VM code was spun off as an external VMMaker package that you have to explicitly load.
This 2008 post in Eliot's blog shows the first changes he made to Squeak's bytecodes: http://www.mirandabanda.org/cogblog/category/cog/page/15/
Thanks.
Here is a 2016 paper about the changes to the OpenSmalltalk bytecodes:
https://rmod.inria.fr/archives/papers/Bera14a-IWST-BytecodeS...