legacy-circuit-mockups

This skill generates breadboard circuit mockups and visual diagrams for retro computing and electronics projects using HTML5 Canvas drawing techniques. It solves the problem of visualizing component placement and wiring for vintage hardware builds, letting users produce interactive circuit layouts featuring components like the 6502 microprocessor, 555 timer ICs, EEPROMs, and 7400-series logic gates. It is oriented toward hobbyist and educational electronics, including Ben Eater-style tutorial builds.

The skill supports a broad component catalog: microprocessors and memory (W65C02S, 28C256 EEPROM, W65C22 VIA, 62256 SRAM), logic and timer ICs (NE555, and 7400/7402/7404/7408/7432 gates), and passive/active parts (LEDs, resistors, capacitors, crystals, switches, buttons, potentiometers, photoresistors). It defines a canvas grid system with 20px spacing, a component rendering data structure with position, size, and rotation, and a wire-connection format with color coding. It provides step-by-step workflows for building LED circuits, 555 timer circuits, and full 6502 microprocessor layouts, along with an extensive reference section: component pinouts, resistor and 555 timer formulas, capacitor calculations, wire and LED color conventions, and worked build examples. A large bundle of reference files covers individual chips, assembly language, emulators, and EEPROM programmers.

The target users are electronics hobbyists, educators, students, and retro-computing enthusiasts who want clear visual references for building circuits on breadboards. Typical use cases include mocking up a 555 blinker, planning a 6502 computer, or producing educational diagrams. This is purely a diagramming and reference skill using client-side canvas rendering, with no system-level or network behavior.