# Defender: annotated arcade disassembly

> Defender-Source-Code documents the Williams Defender arcade game in an annotated disassembly. It labels PCB registers, RAM variables and game routines, with separate notes for palette values and ROM check bytes.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/AaronBottegal/Defender-Source-Code>
- Primary source: <https://github.com/AaronBottegal/Defender-Source-Code/blob/5f6030d7847c1895954fcbe4b1e3dc7e31823046/SourceCode.txt>
- Catalog page: <https://awesomerea.org/resources/defender-arcade-disassembly-case/>
- Record JSON: <https://awesomerea.org/resources/defender-arcade-disassembly-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/defender-arcade-disassembly-case/index.md)

## Requirements & limits

- **Limits:** The disassembly is marked as work in progress.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/AaronBottegal/Defender-Source-Code/blob/5f6030d7847c1895954fcbe4b1e3dc7e31823046/SourceCode.txt>
2. <https://github.com/AaronBottegal/Defender-Source-Code/blob/5f6030d7847c1895954fcbe4b1e3dc7e31823046/Notes.txt>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.