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From there, you would be well served by working through Hennessy and Patterson's Computer Architecture and Computer Organization and Design.
In parallel, you could work through a book on Operating Systems, maybe even playing with the code for a toy system (e.g., http://pages.cs.wisc.edu/~remzi/OSTEP/ or https://pdos.csail.mit.edu/6.828/2016/xv6.html).
An alternative or perhaps parallel approach would be to play the assembly games put out by Zachtronics.
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From there, you would be well served by working through Hennessy and Patterson's Computer Architecture and Computer Organization and Design.
In parallel, you could work through a book on Operating Systems, maybe even playing with the code for a toy system (e.g., http://pages.cs.wisc.edu/~remzi/OSTEP/ or https://pdos.csail.mit.edu/6.828/2016/xv6.html).
An alternative or perhaps parallel approach would be to play the assembly games put out by Zachtronics.