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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.
A while back I saw some work by u/adix that made me realize that modifying py65 was fairly straight forward. After getting it to simulate SD card access, I decided to see if I could get it to handle interrupts as well. With those changes I could use my hardware binary with py65. Check out the needed modifications on my GitHub. Of course, the changes that you need to make will be based on your particular build and code but hopefully my work will point you in the right direction if you're interested.