Legacy Circuit Mockups Skill for Claude Code: What It Does and How to Install It

Makes the agent draw breadboard circuit mockups with HTML5 Canvas for retro builds such as a 6502 computer or a 555 timer.

Installs: 8.9K; on skills.sh
Stars: 40.7K; on GitHub
Files: 20; besides SKILL.md
Updated: Oct 2026; last repo commit

The agent follows a grid of 20 px cells, places components as objects with a type, position, size and rotation, and draws wires with colour codes (red for +5V, black for ground, blue for address bus, green for data bus). It has step-by-step workflows for an LED circuit, a 555 timer circuit and a 6502 layout, two build examples, pinout tables, formulas and a troubleshooting table.

The skill lists 18 component types in three tables: 4 processors and memory chips, 6 logic and timer ICs, and 8 passive and active parts. The folder holds 20 reference files besides SKILL.md and bundles no scripts. The diagrams are drawings, so check any wiring against the datasheets before you build.

Good for

Hobbyists planning a Ben Eater style 6502 breadboard build
Teachers who want educational electronics visuals
Anyone who needs a wiring picture of a 555 or LED circuit

Install legacy-circuit-mockups

Claude Code

Copy this prompt.

Install the legacy-circuit-mockups skill in Claude Code. Run this command:

npx skills add https://github.com/github/awesome-copilot --skill legacy-circuit-mockups

Then check that it loaded and tell me how to use it.

2
Paste it into Claude Code. It shows the change and asks before running it.

Requires Node.js.

From its listing on skills.sh. Source.

What's in the skill

When it loads

Generate breadboard circuit mockups and visual diagrams using HTML5 Canvas drawing techniques. Use when asked to create circuit layouts, visualize electronic component placements, draw breadboard diagrams, mockup 6502 builds, generate retro computer schematics, or design vintage electronics projects. Supports 555 timers, W65C02S microprocessors, 28C256 EEPROMs, W65C22 VIA chips, 7400-series logic gates, LEDs, resistors, capacitors, switches, buttons, crystals, and wires.

Sections in SKILL.md

When to Use This Skill
Prerequisites
Supported Components
Microprocessors & Memory
Logic & Timer ICs
Passive & Active Components
Grid System
Component Rendering Pattern
Wire Connections
Step-by-Step Workflows
Creating a Basic LED Circuit Mockup
Creating a 555 Timer Circuit
Creating a 6502 Microprocessor Layout
Component Pinout Quick Reference
555 Timer (8-pin DIP)
W65C02S (40-pin DIP) - Key Pins

Key facts

Author: (awesome-copilot) community collection in github/awesome-copilot; no individual author is named
License: MIT (repo LICENSE, Copyright GitHub, Inc.)
Installs on skills.sh: 8,906 (Nov 2, 2026)
GitHub stars: 40,666 for the whole awesome-copilot repo (Nov 2, 2026)
Last repo commit: Oct 30, 2026
Audits on skills.sh: Gen Agent Trust Hub: pass, Socket: pass, Snyk: pass
What it includes: 21 files including SKILL.md: 20 reference files; it bundles no scripts

What it includes

6 steps from breadboard grid and power rails to labels
Try: “Mock up a breadboard with a red LED and a 220 ohm resistor”
Read · Basic LED circuit mockup
6 steps from placing the NE555 to wiring the output to an LED
Includes astable and monostable formulas.
Read · 555 timer circuit
8 steps: W65C02S, 28C256 EEPROM, W65C22 VIA, 7400 logic, buses and reset
Try: “Draw a 6502 breadboard layout with an EEPROM and a VIA”
Read · 6502 layout
Build 1 is a single LED; Build 2 is a 555 astable blinker
Read · Build examples
Pinouts for the 555, W65C02S and 28C256, plus wire and LED colour tables
Read · Quick reference tables
Ohm's law, LED resistor, 555 timing, capacitor formulas and a 5-row fix table
Read · Formulas and troubleshooting
20 files in references/ for chips, assembly, emulators and programmers
Read · Reference files

From the official docs

Questions

What does the legacy-circuit-mockups skill do?

It makes the agent produce breadboard circuit diagrams drawn with HTML5 Canvas. It knows the pinouts and wiring conventions for the 6502 family, 555 timers, EEPROMs and 7400-series gates.

How do I install it?

Use the install box at the top of this page. The folder is SKILL.md plus 20 Markdown reference files and bundles no scripts.

Which components does it know?

W65C02S, 28C256, W65C22 and 62256 chips; NE555 and the 7400, 7402, 7404, 7408 and 7432 logic ICs; and LEDs, resistors, capacitors, crystals, switches, buttons, potentiometers and photoresistors.

Do I need an API key?

No key is named in SKILL.md. The folder holds Markdown reference files only.

Is it safe?

It bundles no scripts, only SKILL.md and Markdown reference files, and its output is drawings. SKILL.md does not say its pinouts and voltages are checked against datasheets, so confirm any pin or voltage against the datasheet before you wire real parts.

Does it generate working HTML?

SKILL.md shows the Canvas drawing pattern for components and wires and tells the agent to use it. It does not bundle a rendering program, so the agent writes the page.

Information

updated Nov 2, 2026

Repository: github/awesome-copilot
Folder: skills/legacy-circuit-mockups

github/awesome-copilot skills.sh

Sources

Docs, issue trackers and discussions this page is built from.

Show all 1

legacy-circuit-mockups SKILL.md · github.com