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PostPosted: Fri Apr 26, 2024 7:48 pm 
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Joined: Fri Apr 26, 2024 7:26 pm
Posts: 2
Not sure why I made this yet, but I enjoyed the process and now I feel a lot more comfortable with the 6502 instruction set

Available at: https://github.com/bencoder/6502

I added a basic console IO interface and got Wozmon working on it :)

Notes:
- Haven't done anything clever with opcode decoding, just a big switch statement
- It passes the Klaus functional tests
- Cycle counts are probably not accurate, haven't been thoroughly tested (just basing it on memory read/writes, with +1 adjustment when paging in indexed addressing modes)
- illegal/undocumented opcodes haven't been implemented
- undefined behaviour (I think that's only the weird decimal mode flags) hasn't been implemented/tested

Comments/Criticism welcome :)


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PostPosted: Sat May 04, 2024 12:59 pm 
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Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10985
Location: England
Welcome! Nice idea - haven't tried it though. Should it be relative easy to make up an HTML page, and serve the emulator from github directly as an in-browser emulator?


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PostPosted: Tue May 07, 2024 6:08 pm 
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Joined: Sat Oct 28, 2023 7:57 pm
Posts: 22
Location: Missouri
Neat! How fast can you "clock" it? It looks like it's set to 1 MHz, but can it go faster?


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PostPosted: Wed Jun 05, 2024 5:10 pm 
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Joined: Fri Apr 26, 2024 7:26 pm
Posts: 2
Sorry for the delayed response

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How fast can you "clock" it? It looks like it's set to 1 MHz, but can it go faster?

It goes about 70MHz unrestricted while running the test suite (on a 2020 Macbook Air M1)

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Should it be relative easy to make up an HTML page, and serve the emulator from github directly as an in-browser emulator?

Yeah that might be a nice idea to show it off better - thanks


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