legacy-circuit-mockups

Generate breadboard circuit mockups and diagrams using HTML5 Canvas drawing techniques.

1|1|Updated Jan 29, 2026
One-click install
npx skills add https://github.com/ultraviollettnympho/transit-ticket --skill legacy-circuit-mockups-ultraviollettnympho
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: legacy-circuit-mockups
Source: https://github.com/ultraviollettnympho/transit-ticket/tree/main/.github/skills/legacy-circuit-mockups
Command: npx skills add https://github.com/ultraviollettnympho/transit-ticket --skill legacy-circuit-mockups-ultraviollettnympho

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve? Designing retro electronics projects like 6502 computers or 555 timer circuits requires careful planning of component placement and wiring on a breadboard, and doing this on paper is error-prone and hard to revise. This Skill produces visual breadboard mockups and circuit diagrams so builders can verify layouts before touching physical hardware. ## Core Features & Use Cases - Breadboard Layout Generation: Render component placements and wire connections on a standard 20px grid using HTML5 Canvas, with support for rotation and color-coded wiring. - Vintage Component Library: Includes pinouts and rendering specs for the W65C02S microprocessor, 28C256 EEPROM, W65C22 VIA, 62256 SRAM, NE555 timer, 7400-series logic gates, LEDs, resistors, capacitors, switches, and crystals. - Engineering Reference Data: Bundled datasheets cover pinouts, timing formulas (astable/monostable 555 calculations, Ohm's law, LED current limiting), assembly language conventions, and EEPROM programming workflows. - Use Case: A hobbyist following Ben Eater's 6502 breadboard computer series asks for a mockup of the clock module; the Skill produces a canvas diagram showing the 555 timer, resistors, capacitors, and wire routing with correct pin connections. ## Quick Start Ask the assistant to create a breadboard mockup of a 555 timer astable blinker circuit with an LED output.

Frequently Asked Questions about legacy-circuit-mockups

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I create a breadboard layout diagram for a 6502 computer?

Place the W65C02S centered on the breadboard, add the 28C256 EEPROM and W65C22 VIA, then wire the address bus, data bus, and control signals using color-coded connections. The Skill renders this on a 20px grid via HTML5 Canvas with standard breadboard conventions.

What components can I draw in a circuit mockup?

Supported components include the W65C02S, 28C256 EEPROM, W65C22 VIA, 62256 SRAM, NE555 timer, 7400/7402/7404/7408/7432 logic gates, LEDs, resistors, capacitors, crystals, switches, buttons, potentiometers, and photoresistors.

How do I calculate resistor values for a 555 timer astable circuit?

Use the formula f = 1.44 / ((R1 + 2×R2) × C) for frequency, with high time t₁ = 0.693 × (R1 + R2) × C and low time t₂ = 0.693 × R2 × C. The bundled 555 reference includes full monostable and astable timing equations.

Does the mockup check that my circuit wiring is electrically correct?

The Skill focuses on visual layout and placement rather than electrical simulation. It provides pinout references and troubleshooting tables, but it does not simulate current flow or validate circuit behavior like a SPICE simulator would.

Why is my LED not lighting in the breadboard build?

The most common cause is reversed polarity: the anode must connect toward positive voltage and the cathode toward ground. Also verify the current-limiting resistor value using R = (Vcc - Vled) / Iled and confirm power rail continuity.