py65 VS py65_65816

Here’s a working one already https://github.com/mnaberez/py65

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.

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.

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.

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.

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.

I recommend cc65 as well and might as well mention the py65 emulator. Both are great tools that have aided my development.

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.

Thanks. I've been using py65 for my development.

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.

One issue I had when I was finishing up my emulator was finding substantial programs to test that weren't designed for a particular architecture. I'm focused mainly on text-based programs, so it might not be as interesting for your emulation, but OF816, by Michael Guidero, is a larger program designed to be easily ported to new 65816-based systems. Here's my fork of it for my py65816 emulator as another example of porting it to an emulator. If you don't want to bother creating your own port or creating a binary, here's one with I/O mapped to 7FC0 and 7FE0 respectively. Load it at $8000 and reset to start. It uses bank 0 and bank 1 so you need to have at least those modeled.

Unfortunately, Liara Forth is coded specifically for the w65c265sxb development board. I'm not sure how hard it would be to get it running on 816sxb. I was able to get it running in my py65816 simulation by changing the getc and putc addresses in the binary. Maybe something similar would work for you.

I still have a lot of testing to do and not all features of the 65C816 are working yet. You can test it out yourself and follow my progress at GitHub.