HTML5 Canvas breadboard circuit mockups for retro computing and vintage electronics projects.
Works with
Supports 40+ components including W65C02S microprocessors, 555 timers, 28C256 EEPROMs, W65C22 VIAs, 7400-series logic gates, and passive components like LEDs, resistors, and capacitors
Renders circuits on a 20px grid system with component rotation, wire color coding, and pinout reference tables for accurate layout visualization
Includes step-by-step workflows for common builds: LED circuits,
AI-first code editor with Composer
Before installing skills in Cursor, ensure your development environment meets these requirements:
node --versionlegacy-circuit-mockupsExecute the skills CLI command in your project's root directory to begin installation:
Fetches legacy-circuit-mockups from github/awesome-copilot and configures it for Cursor.
The CLI shows a list of agents. Use arrow keys and space to select Cursor:
Confirm successful installation by checking the skill directory location:
Restart Cursor to activate legacy-circuit-mockups. Access via /legacy-circuit-mockups in your agent's command palette.
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your environment. Always review source, verify the publisher, and test in isolation before production.
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A skill for creating breadboard circuit mockups and visual diagrams for retro computing and electronics projects. This skill leverages HTML5 Canvas drawing mechanisms to render interactive circuit layouts featuring vintage components like the 6502 microprocessor, 555 timer ICs, EEPROMs, and 7400-series logic gates.
| Component | Pins | Description |
|---|---|---|
| W65C02S | 40-pin DIP | 8-bit microprocessor with 16-bit address bus |
| 28C256 | 28-pin DIP | 32KB parallel EEPROM |
| W65C22 | 40-pin DIP | Versatile Interface Adapter (VIA) |
| 62256 | 28-pin DIP | 32KB static RAM |
| Component | Pins | Description |
|---|---|---|
| NE555 | 8-pin DIP | Timer IC for timing and oscillation |
| 7400 | 14-pin DIP | Quad 2-input NAND gate |
| 7402 | 14-pin DIP | Quad 2-input NOR gate |
| 7404 | 14-pin DIP | Hex inverter (NOT gate) |
| 7408 | 14-pin DIP | Quad 2-input AND gate |
| 7432 | 14-pin DIP | Quad 2-input OR gate |
| Component | Description |
|---|---|
| LED | Light emitting diode (various colors) |
| Resistor | Current limiting (configurable values) |
| Capacitor | Filtering and timing (ceramic/electrolytic) |
| Crystal | Clock oscillator |
| Switch | Toggle switch (latching) |
| Button | Momentary push button |
| Potentiometer | Variable resistor |
| Photoresistor | Light-dependent resistor |
// Standard breadboard grid: 20px spacing
const gridSize = 20;
const cellX = Math.floor(x / gridSize) * gridSize;
const cellY = Math.floor(y / gridSize) * gridSize;
// All components follow this structure:
{
type: 'component-type',
x: gridX,
y: gridY,
width: componentWidth,
height: componentHeight,
rotation: 0, // 0, 90, 180, 270
properties: { /* component-specific data */ }
}
// Wire connection format:
{
start: { x: startX, y: startY },
end: { x: endX, y: endY },
color: '#ff0000' // Wire color coding
}
| Pin | Name | Function |
|---|---|---|
| 1 | GND | Ground (0V) |
| 2 | TRIG | Trigger (< 1/3 Vcc starts timing) |
| 3 | OUT | Output (source/sink 200mA) |
| 4 | RESET | Active-low reset |
| 5 | CTRL | Control voltage (bypass with 10nF) |
| 6 | THR | Threshold (> 2/3 Vcc resets) |
| 7 | DIS | Discharge (open collector) |
| 8 | Vcc | Supply (+4.5V to +16V) |
| Pin | Name | Function |
|---|---|---|
| 8 | VDD | Power supply |
| 21 | VSS | Ground |
| 37 | PHI2 | System clock input |
| 40 | RESB | Active-low reset |
| 34 | RWB | Read/Write signal |
| 9-25 | A0-A15 | Address bus |
| 26-33 | D0-D7 | Data bus |
| Pin | Name | Function |
|---|---|---|
| 14 | GND | Ground |
| 28 | VCC | Power supply |
| 20 | CE | Chip enable (active-low) |
| 22 | OE | Output enable (active-low) |
| 27 | WE | Write enable (active-low) |
| 1-10, 21-26 | A0-A14 | Address inputs |
| 11-19 | I/O0-I/O7 | Data bus |
Astable Mode:
Monostable Mode:
| Color | Purpose |
|---|---|
| Red | +5V / Power |
| Black | Ground |
| Yellow | Clock / Timing |
| Blue | Address bus |
| Green | Data bus |
| Orange | Control signals |
| White | General purpose |
| Color | Forward Voltage |
|---|---|
| Red | 1.8V - 2.2V |
| Green | 2.0V - 2.2V |
| Yellow | 2.0V - 2.2V |
| Blue | 3.0V - 3.5V |
| White | 3.0V - 3.5V |
Components: Red LED, 220Ω resistor, jumper wires, power source
Steps:
Components: NE555, LED, resistors (10kΩ, 100kΩ), capacitor (10µF)
Steps:
| Issue | Solution |
|---|---|
| LED doesn't light | Check polarity (anode to +, cathode to -) |
| Circuit doesn't power | Verify power rail connections |
| IC not working | Check VCC and GND pin connections |
| 555 not oscillating | Verify threshold/trigger capacitor wiring |
| Microprocessor stuck | Check RESB is HIGH after reset pulse |
Detailed component specifications are available in the bundled reference files:
Prerequisites
Time Estimate
15-45 minutes depending on use case complexity
Steps
Common Pitfalls
✓ Do
✗ Don't
💡 Pro Tips
✓ Use when
Use when skill capabilities match your task, clear ROI on time saved, and you can validate outputs. Best for repetitive tasks, learning, and quality improvement.
✗ Avoid when
Avoid when task requires deep expertise you can't validate, involves sensitive decisions, or when learning process is more valuable than speed of completion.
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Keeps context tight: legacy-circuit-mockups is the kind of skill you can hand to a new teammate without a long onboarding doc.
We added legacy-circuit-mockups from the explainx registry; install was straightforward and the SKILL.md answered most questions upfront.
legacy-circuit-mockups has been reliable in day-to-day use. Documentation quality is above average for community skills.
legacy-circuit-mockups reduced setup friction for our internal harness; good balance of opinion and flexibility.
Solid pick for teams standardizing on skills: legacy-circuit-mockups is focused, and the summary matches what you get after install.
Registry listing for legacy-circuit-mockups matched our evaluation — installs cleanly and behaves as described in the markdown.
legacy-circuit-mockups reduced setup friction for our internal harness; good balance of opinion and flexibility.
We added legacy-circuit-mockups from the explainx registry; install was straightforward and the SKILL.md answered most questions upfront.
Useful defaults in legacy-circuit-mockups — fewer surprises than typical one-off scripts, and it plays nicely with `npx skills` flows.
legacy-circuit-mockups is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
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