X86 ENTER: What’s that Second Parameter?

[Raymond Chen] wondered why the x86 ENTER instruction had a strange second parameter that seems to always be set to zero. If you’ve ever wondered, [Raymond] explains what he learned in a recent blog post.

This is a companion discussion topic for the original entry at https://hackaday.com/2023/12/12/x86-enter-whats-that-second-parameter/