https://github.com/synt4xerr0r4/nesdoc

Some documentation about the NES
https://github.com/synt4xerr0r4/nesdoc

6502 assembly emulator nes

Last synced: about 1 month ago
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Some documentation about the NES

• Host: GitHub
• URL: https://github.com/synt4xerr0r4/nesdoc
• Owner: Synt4xErr0r4
• License: mit
• Created: 2022-02-07T22:51:57.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2022-02-09T19:39:43.000Z (over 4 years ago)
• Last Synced: 2025-07-28T11:41:17.774Z (11 months ago)
• Topics: 6502, assembly, emulator, nes
• Language: PHP
• Homepage: https://nes.syntaxerror.at/
• Size: 150 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# nesdoc

Some documentation about the NES (Nintendo Entertainment System).  

This is the source code for my NES documentation at https://nes.syntaxerror.at/.  

If you find any errors or want to contribute any improvements/changes/additions, feel free to create an issue or a pull request!

## 6502 CPU

In [/static/data/](https://github.com/Synt4xErr0r4/nesdoc/tree/main/static/data) you can find several files:

- instructions.json and instructions.csv: a JSON/CSV file containing all the instructions of the 6502 with addressing mode, operation, cycles, and affected flags

- timings.json: a JSON file containing the timings and cycles of all addressing modes/ instructions of the 6502

## Sources

- https://wiki.nesdev.org/w/index.php?title=CPU_addressing_modes

- https://www.nesdev.com/6502_cpu.txt

- http://www.oxyron.de/html/opcodes02.html

- https://www.masswerk.at/nowgobang/2021/6502-illegal-opcodes

- https://wiki.nesdev.org/w/index.php?title=CPU_unofficial_opcodes