The 6502 instruction set as a database
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The 6502 instruction set as a database
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Re: The 6502 instruction set as a database
#2This is a very nice presentation, the .sql file contains a lot of notes about the sourcing for the data. I could imagine adding test vectors to the database as well.
Re: The 6502 instruction set as a database
#3Up next: 6502 emulator in a single SQL query
Re: The 6502 instruction set as a database
#4Great idea, this could be valuable for people who write their own assembler.
It's the first time I see an instruction set as a relational database, which I would imagine is a very portable way to describe a machine, perhaps it might be worth collecting other machine specs in that same format and then create a portable assembler that uses the specficic DBs.
Re: The 6502 instruction set as a database
#5Since this is SQLite SQL, I copied it into a Gist (to give it CORS headers) and now you can open it directly in Datasette Lite (Datasette in WebAssembly running entirely in the browser):
https://lite.datasette.io/?sql=https://gist.github.com/simon...
Here are the 65 hardcoded opcodes: https://lite.datasette.io/?sql=https://gist.github.com/simon...
And the 64 instructions: https://lite.datasette.io/?sql=https://gist.github.com/simon...
Re: The 6502 instruction set as a database
#6In a reductionist sense this is "sql is Turing complete" which is long known, A voyage of discovery aside the joy is the execution and efficiency. I'd be delighted if I'd done this.
Re: The 6502 instruction set as a database
#7Some other instruction sets in some JSON: https://github.com/asmjit/asmjit/tree/master/db
Re: The 6502 instruction set as a database
#8Not sure what the advantage is, relative to the tables as CSV files.
Re: The 6502 instruction set as a database
#9Not sure what the advantage is, relative to the tables as CSV files.
The ability to ship SQL views that join multiple tables as part of the schema is pretty cool, and something you can't come close to replicating with CSVs.
https://lite.datasette.io/?sql=https://gist.github.com/simon...
Re: The 6502 instruction set as a database
#10Not sure what the advantage is, relative to the tables as CSV files.
The ability to ship SQL views that join multiple tables as part of the schema is pretty cool, and something you can't come close to replicating with CSVs. https://lite.datasette.io/?sql=https://gist.github.com/simon...
I like how it looks, and I appreciate the effort that went into it, but other than using it to export a table in just a right format that you will then embed into your assembler directly, I'm not sure how to use it.
And I use opcode references [1] very often (sometimes daily, depending on the project). I even wrote my own disassemblers. But I mostly use opcode references for manual cross checking, so maybe I'm not a target of this project?
[1] My favorite one for x64 is https://ref.x86asm.net/coder64.html