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I always thought it would be cool to build an entire toy “stack”. Maybe start with a language, DB, and web server. You could start out simple, for example building a language that transpiles to JS, and overtime replace parts with lower level implementations

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It can go a lot deeper: take the Tokyo University CPU project as an inspiration:

You need to use FPGA board to build a machine that runs an OS ported to this architecture, which has a high level language with a proper tool chain, all built by yourself. Then you use the language to build DB, Webserver and such.

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