# trebonian/visual6502

Transistor level 6502 Hardware Simulation in Javascript

Repository: https://github.com/trebonian/visual6502
Canonical: https://ross.abutalabs.com/products/visual6502
Language: JavaScript
License Family: other
Last push: 2022-03-06T15:59:24+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5829, "days_push": 1641, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1118, forks 147 (observed 2026-08-28T04:03:39.116967+00:00)

## What it is
A browser-based transistor-level simulator of the 6502 (and 6800) microprocessors, originally from visual6502.org. It includes a general-purpose transistor-level simulation engine, a chip layout browser, and extracted data from a 6502 revD die.

## Use cases
- simulate a 6502 CPU at the transistor level in the browser
- inspect the physical layout of a 6502 chip
- learn how microprocessors work at the silicon level
- trace signals through the 6502 circuitry
- study vintage CPU internals for retro-computing projects
- run a 6800 simulation for comparison

## When to choose
- you need cycle-accurate, transistor-level emulation of the 6502 or 6800
- you want to visualize and explore actual chip layout data
- you're teaching or learning computer architecture with real silicon data

## When to avoid
- you need a fast, practical 6502 emulator for running software
- you need support for other CPUs or modern instruction sets
- you require an actively maintained project with a clear license

## Facets
- artifact type: application
- maturity: maintenance
- function: simulation, graphics, developer-tools
- domain: hardware, simulation, education
- platform: browser
- tags: emulation, retro-computing, transistor-level, 6502, 6800, chip-visualization, javascript

## Member repositories
- trebonian/visual6502 (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:39.116967+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:41:50.658325+00:00, confidence not recorded.
  - readme: https://github.com/trebonian/visual6502 (fetched 2026-08-28T04:03:39.116967+00:00, sha a0bb5062cab4)
- Data as of 2026-08-30T08:39:29.467469+00:00.