I've been noticing that in a number of japhy's posts, he gives opcode listings to support his points. I think that's an amazing thing to do. However, I am clueless when it comes to the opcodes, what they do, and how they're generated. Yes, I know I should go look at the interpreter code, but I'm lazy. :)

So, I was wondering the following:

1. Is there was a master list of opcodes as well as a design for the algorithm(s) used to generate those listings?
2. Is there a program that just does the execution phase? In other words, if I generate my own opcode listing, is there something that could run it?
3. How on earth do people generate those opcode listings?

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