py65
Emulate 6502-based microcomputer systems in Python (by mnaberez)
py65816
Emulate 65816-based microcomputer systems in Python (by tmr4)
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py65 | py65816 | |
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11 | 3 | |
226 | 4 | |
- | - | |
6.7 | 0.0 | |
16 days ago | almost 2 years ago | |
Python | Python | |
BSD 3-clause "New" or "Revised" License | GNU General Public License v3.0 or later |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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
Posts with mentions or reviews of py65.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-07-11.
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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.
py65816
Posts with mentions or reviews of py65816.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-04-13.
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Ben's 6502 running with a 65816
There are several Forth versions for the 65816 that I've found online. Some are specialized to specific hardware but can be modified. Michael Guidero's OF816 is designed to be easily ported to new systems. I got it running on my 65816 emulator without much problem. It handles banked memory and uses a good subset of 65816 features.
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65816 assembly question... porting Ben's vga.s to 24-bit addressing
That's how I learned the 65816 and Python at the same time. Here's my 65816 enhancement to py65. I took longer than I thought it would (mostly writing the tests to validate the emulation).
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Some helpful 65816 programming tools
I found some alternative tools, but really wanted to continue using what I was familiar with, so that took some programming work as I couldn't find any options for my current tools. I've already written about my work on a py65 based 65816 emulator. I've refined it a bit and created a version that doesn't require modifications to py65. It's available on my py65816 GitHub. With that down, I only needed a 65816 listing file.
What are some alternatives?
When comparing py65 and py65816 you can also consider the following projects:
6502 - DB6502: 65C02 based computer inspired by BE6502
cc65 - cc65 - a freeware C compiler for 6502 based systems
6502 - Code for the 6502 microprocessor, mostly for the Replica 1 computer.
w65c816sxb-forth - A Direct Threaded Forth for the WDC W65C816SXB developer board
py65_65816 - Add support for the 65C816 to py65
of816 - Portable 32-bit Forth for the 65C816.
TaliForth2 - A Subroutine Threaded Code (STC) ANS-like Forth for the 65c02
LiaraForth - An "initial" ANSI(ish) Forth for the W65C265SXB SBC (65816 CPU)
m6502 - 6502 CPU implementation written in nMigen
py_z80 - A Python emulator for the Z80 CPU.