py65
cc65
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py65 | cc65 | |
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11 | 24 | |
226 | 2,199 | |
- | 1.9% | |
6.7 | 9.6 | |
15 days ago | 10 days ago | |
Python | C | |
BSD 3-clause "New" or "Revised" License | zlib License |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
py65
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Writing a 6502 emulator in Python
Here’s a working one already https://github.com/mnaberez/py65
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Some helpful 65816 programming tools
I use the cc65 toolset to program my 65c02 projects and the py65 emulator to help debug them. I use a slightly modified version of da65, the cc65 disassembler, to create a complete listing of my code, something I find very useful for multi-file projects.
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Simulating the 65C816 in py65
I've recommended py65, by Mike Naberezny, for 6502 development and have created several enhancements to it for my own builds (interrupt handling and debug window). Unfortunately, py65 doesn't support the 65C816. Luckily, it's open source and easy to modify, so I thought I'd try adding support for the 65C816.
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Adding a separate debug window to the py65 6502 emulator
I didn't understand Python enough at the time. I could probably figure it out now that I know more, but those commands aren't really useful to me for how I use the monitor. I added the continue command which does what I wanted. Interestingly, someone requested that a continue command be added to py65 back in 2019.
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Handling 6502 interrupts in py65
Py65, by Mike Naberezny, is a great simulator for the 6502. I recommend checking it out, especially as your 6502 build and code get more advanced. Py65 doesn't handle interrupts though, so if your build uses them, you either need to create a version of your code to simulate or modify py65 to handle your hardware binary. The former is the best option for most people, but the latter might be attractive to folks who don't want to deal with two versions of their code.
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Ok, this is a better video than my post yesterday... Improved VGA circuit for my 6502 [currently prototyping] (and with added mouse support 😃)
Thanks for all of the info. It looks very interesting. I'll have to resist getting sidetracked. Not easy to do. I'm currently on another sidetrack adding interrupt capability to the py65 simulator. Not really needed, but it means I don't need to maintain a separate code base for the simulator. It has the added benefit of letting me work with Python.
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6502 development 'philosophy??
I recommend cc65 as well and might as well mention the py65 emulator. Both are great tools that have aided my development.
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Playing Cosmic Conquest, a old-style real-time strategy game, on my breadboard 6502
Luckily there is a nice 6502 emulator, py65, that makes development easier. Without that I don't think I would have every attempted this. Once I got it running on the emulator it was fairly straight forward getting it to run on the breadboard 6502. Working on the actual hardware did provide some unique challenges though.
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Enhanced version of Cosmic Conquest (a Forth based game from 1982)
Thanks. I've been using py65 for my development.
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An attempt at resurrecting Cosmic Conquest (1982). PRs welcome. I expect a challenge on this one.
I'll probably be working to get a version of this running in my ANSIish Forth in py65, a simulation of the 6502 in python. Py65 runs fine with terminal escape codes running in a compatible terminal program. I've tried it with Conway's Game of Life which works similarly.
cc65
- C Compiler Assembler and Runtime for C64
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C Is Not a Low-level Language – Your computer is not a fast PDP-11
True. The code generated by https://cc65.github.io/ is pretty decent but there are a few places where hand-rolled assembler will perform much better when you need it. Although I've made things for 6502-based systems in C with this handy compiler (thanks cc65 contributors!).
Is there something intrinsic to how C handles addressing that makes segmented architectures more painful than they ought to be? Or maybe is there a language where segmented addressing is easier?
I hadn't really thought about it in a while. :)
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Best practice to store context for a C compiler
cc65
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How did people learn to make games in the 80s
There's tools like cc65 that let you write C code for the NES.
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i need some serious help learing the VICE emulator for c64.
You can use any text editor for coding and the tutorial uses cc65 for compiling assembly to machine code.
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Has anyone used LLVM/Clang to create modern NES games?
You can use cc65 https://cc65.github.io/ but because you are compiling it in a limit hardware the cc65 has its rules and recommendations to follow in order to get the most optimal binaries, and more specifically I read this when I made the "Pong" game for NES as a practice long time ago https://nesdoug.com/ , I hope it helps, happy coding!
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My custom single board computer, 65c02-based with multitasking support
What assembler/tools did you use anyways? Personally I'd recommend ca65 from the cc65 C compiler utility. It's very powerful, open source, and kept updated (unlike a lot of ancient 6502 tools, like WDC's)
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A Graphical OS for the Atari 8-bit
It really is a cool project. https://github.com/cc65/cc65
It provides some template configuration files describing different memory layouts. And provides common libraries for input/output.
There's also a LLVM fork for MOS: https://github.com/llvm-mos/llvm-mos
They've got some interesting hacks with ZeroPage memory and register allocation: https://llvm-mos.org/wiki/Code_generation_overview
Interesting if you geek out on that kind of research.
- cc65 - a freeware C compiler for 6502 based systems
- Action
What are some alternatives?
6502 - DB6502: 65C02 based computer inspired by BE6502
llvm-mos - Port of LLVM to the MOS 6502 and related processors
6502 - Code for the 6502 microprocessor, mostly for the Replica 1 computer.
py65_65816 - Add support for the 65C816 to py65
cc65-tools - Docker image for CC65 and tools
TaliForth2 - A Subroutine Threaded Code (STC) ANS-like Forth for the 65c02
wcc - wo4mei3's c compiler written in ocaml
m6502 - 6502 CPU implementation written in nMigen
6502-Breadboard-Computer - code for my breadboard computer
py65816 - Emulate 65816-based microcomputer systems in Python
fdraw - Fast Apple II hi-res graphics