I think it's worth mentioning Gustavo Pezzi's lectures at pikuma.com. The one on "Digital Electronics" and the one on "Interpreters & Compilers" really helped me.
The first time I saw Wren was as an option for programming inside TIC-80. It caught my attention. I recently saw it again being mentioned by Gustavo (from pikuma.com) in his compilers course. Neat language and the VM code in C is quite easy to understand.
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