Case study

6502 Model: reconstructing 65C02 cycle behavior

6502 Model reconstructs the 65C02 chip’s cycle behavior in Rust from traces of external buses recorded during execution on a physical chip. Contributors add programs and signed traces as failing cases, then implement behavior to match the observed cycles.

Targets: Firmware
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-07

Stars: 10
Last commit: 2026-03-07
Language: Rust
License (GitHub): BSD-3-Clause

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: A physical 65C02 trace collected through ChipLab is used when adding behavior.
Limits: Official instructions, timing details, flags, interrupts and unofficial instructions remain on the roadmap.
License: BSD-3-Clause License.

Cite

BibTeX

@misc{6502-model-case,
  title = {{6502 Model: reconstructing 65C02 cycle behavior}},
  howpublished = {\url{https://github.com/EmulationOnline/model_6502}},
  url = {https://github.com/EmulationOnline/model_6502},
  urldate = {2026-11-07},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/6502-model-case/}}
}

Plain text

6502 Model: reconstructing 65C02 cycle behavior. https://github.com/EmulationOnline/model_6502 (accessed 2026-11-07). Awesome REA entry: https://awesomerea.org/resources/6502-model-case/

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Primary sources

README.md GitHub · EmulationOnline/model_6502 · Revision bc7cf14
passing_traces/README.md GitHub · EmulationOnline/model_6502 · Revision bc7cf14