py65
6502
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py65 | 6502 | |
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11 | 6 | |
226 | 284 | |
- | - | |
6.7 | 7.5 | |
16 days ago | 10 days ago | |
Python | Assembly | |
BSD 3-clause "New" or "Revised" License | - |
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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.
6502
- Minimal bare-metal RISC-V project
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Running Apple 1 software on a breadboard computer (Wozmon) [video]
The Apple 1 ROM is quite a tight piece of coding. Just 256 bytes which implements basic console IO, and memory editing in hex. And still two bytes left over.
One version with lots of comments: https://github.com/jefftranter/6502/blob/master/asm/wozmon/w...
You can see a classic assembly language space optimizing trick at PRBYTE. It first prints the upper half of the byte in hex with call to the PRHEX procedure, then falls through to PRHEX again to print the second half. Two entry points to a common routine.
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KIM-Venture -- adventure game based on Colossal Cave written for KIM-1 computer (source code available)
The First Book of KIM programs
- It's quite BASIC
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Playing Cosmic Conquest, a old-style real-time strategy game, on my breadboard 6502
For a command line program I started out with getting WOZMON working and then began adding more capabilities similar to the Apple II system of old. I got tired of adding one-off functionality and discovered Forth when looking at programming languages suited for systems with limited resources. Look into TaliForth2 to get up and running fast on your 6502. The full program requires 24k ROM but can be slimmed down to fit in 16k pretty easily. I was inspired so I wrote my own Forth 2012 Standard version over the summer.
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Hey anyone tried to write an assembler for the 6502?
Jeff Tranter has a github with a ton of stuff 6502, including a mini assembler. Many others out there as well.
What are some alternatives?
6502 - DB6502: 65C02 based computer inspired by BE6502
Cosmic-Conquest-1982 - (Historic) Resurrecting one of the first real time strategy (RTS) games from 1982. Written in Forth.
py65_65816 - Add support for the 65C816 to py65
hbc-56 - Homebrew 6502 on a backplane computer
TaliForth2 - A Subroutine Threaded Code (STC) ANS-like Forth for the 65c02
NES-dev - A simple NES game written in 6502 assembly
m6502 - 6502 CPU implementation written in nMigen
sixty5o2 - Micro Kernel / Bootloader for Ben Eater's 6502 Computer
cc65 - cc65 - a freeware C compiler for 6502 based systems
py65816 - Emulate 65816-based microcomputer systems in Python
msbasic - Microsoft BASIC for 6502 (Commodore, Apple, KIM-1, AIM-65, OSI, ...)