New skill for building legacy hardware circuit mockups

[jhauga]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, or chat mode file in the correct directory. NEW SKILL
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, or chat mode with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

Built using another electronics-breadboard-simulator.html, then used that to finalize this skill in terms of adding components. Wrote the references markdown files, and finalized the same electronics-breadboard-simulator.html page. Seems good, or at the very least a starting point for someone to download, and customize per their project (probably a hobby breadboard simulator).

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Type of Contribution

• New instruction file.
• New prompt file.
• New chat mode file.
• New collection file.
• New skill file.
• Update to existing instruction, prompt, chat mode, collection or skill.
• Other (please specify):

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

This PR adds a new skill for generating breadboard circuit mockups and visual diagrams for legacy hardware projects. The skill targets retro computing enthusiasts and electronics hobbyists building circuits with vintage components like 6502 microprocessors, 555 timers, and 7400-series logic gates.

Changes:

• Adds the legacy-circuit-mockups skill with comprehensive documentation and 12 technical reference files
• Provides detailed component specifications for microprocessors, memory chips, logic ICs, and passive components
• Includes step-by-step build guides for common circuits
• Updates README.skills.md with the new skill entry

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
skills/legacy-circuit-mockups/SKILL.md	Main skill documentation defining components, workflows, and drawing mechanisms
skills/legacy-circuit-mockups/references/555.md	Complete 555 timer IC specification with formulas and circuit diagrams
skills/legacy-circuit-mockups/references/6502.md	MOS 6502 microprocessor reference
skills/legacy-circuit-mockups/references/6522.md	W65C22 VIA interface adapter specification
skills/legacy-circuit-mockups/references/28256-eeprom.md	AT28C256 EEPROM specification
skills/legacy-circuit-mockups/references/6C62256.md	AS6C62256 SRAM specification
skills/legacy-circuit-mockups/references/7400-series.md	7400-series logic IC reference
skills/legacy-circuit-mockups/references/basic-electronic-components.md	Fundamental component reference
skills/legacy-circuit-mockups/references/common-breadboard-components.md	Comprehensive breadboard components guide
skills/legacy-circuit-mockups/references/connecting-electronic-components.md	Step-by-step circuit build instructions
skills/legacy-circuit-mockups/references/lcd.md	LCD character display specification
skills/legacy-circuit-mockups/references/minipro.md	EEPROM programming utility reference
skills/legacy-circuit-mockups/references/t48eeprom-programmer.md	T48 programmer specification
docs/README.skills.md	Adds new skill entry with all reference files listed