Geargrafx MCP — ユースケース, インストール & ライブデモ

なぜ使うのか

主な機能

Embedded MCP server for AI-assisted debugging via stdio or HTTP transport
Full debugger: JIT disassembler, CPU/memory breakpoints, code navigation
Supports HuCard, SuperGrafx, and CD-ROM² formats (pce, sgx, cue, zip, chd)
Multi Tap support for up to 5 players with various controller types
VGM recording and save states with preview images

ライブデモ

実際の動作

geargrafx-2.replay ▶ 準備完了

0/0

インストール

クライアントを選択

~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "geargrafx-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/drhelius/Geargrafx"
      ]
    }
  }
}

Claude Desktop → Settings → Developer → Edit Config を開く。保存後、アプリを再起動。

~/.cursor/mcp.json · .cursor/mcp.json

{
  "mcpServers": {
    "geargrafx-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/drhelius/Geargrafx"
      ]
    }
  }
}

Cursor は Claude Desktop と同じ mcpServers スキーマを使用。プロジェクト設定はグローバルより優先。

VS Code → Cline → MCP Servers → Edit

{
  "mcpServers": {
    "geargrafx-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/drhelius/Geargrafx"
      ]
    }
  }
}

Cline サイドバーの MCP Servers アイコンをクリックし、"Edit Configuration" を選択。

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "geargrafx-2": {
      "command": "TODO",
      "args": [
        "See README: https://github.com/drhelius/Geargrafx"
      ]
    }
  }
}

Claude Desktop と同じ形式。Windsurf を再起動して反映。

~/.continue/config.json

{
  "mcpServers": [
    {
      "name": "geargrafx-2",
      "command": "TODO",
      "args": [
        "See README: https://github.com/drhelius/Geargrafx"
      ]
    }
  ]
}

Continue はマップではなくサーバーオブジェクトの配列を使用。

~/.config/zed/settings.json

{
  "context_servers": {
    "geargrafx-2": {
      "command": {
        "path": "TODO",
        "args": [
          "See README: https://github.com/drhelius/Geargrafx"
        ]
      }
    }
  }
}

context_servers に追加。保存時に Zed がホットリロード。

claude mcp add geargrafx-2 -- TODO 'See README: https://github.com/drhelius/Geargrafx'

ワンライナー。claude mcp list で確認、claude mcp remove で削除。

ユースケース

実用的な使い方： Geargrafx

How to debug a PC Engine ROM with AI assistance using Geargrafx

👤 PC Engine homebrew developers and retro game researchers ⏱ ~30 min intermediate

使うタイミング： You're developing or analyzing a PC Engine ROM and need to debug runtime behavior.

前提条件

Geargrafx built with MCP support — Build from source following the GitHub README
A PC Engine ROM file (.pce or .sgx) — Your own homebrew ROM or a ROM you legally own

フロー

Connect and inspect

Connect to the Geargrafx MCP server. Show me the current HuC6280 CPU state and disassembly at the program counter.✓ コピーしました

→ CPU registers and disassembled instructions
Analyze sprite system

Inspect the VDC sprite table. How many sprites are active and what tiles do they reference?✓ コピーしました

→ Sprite attribute table with positions, tile indices, and flags

結果： Understanding of ROM execution and VDC hardware state for debugging.

注意点

CD-ROM games require proper CUE/BIN setup — Ensure your CUE file paths are correct and all BIN tracks are present

組み合わせ： filesystem

Learn PC Engine hardware architecture interactively

👤 Students and enthusiasts learning retro console hardware ⏱ ~45 min advanced

使うタイミング： You want to understand the HuC6280 CPU, VDC graphics, and PSG audio systems.

前提条件

Geargrafx with MCP server — Build from source

フロー

Explore the VDC

Step through the VBlank interrupt and explain how the PC Engine's VDC handles background scrolling and sprite rendering.✓ コピーしました

→ Annotated explanation of VDC register writes and their effects

結果： Hands-on understanding of PC Engine hardware internals.

注意点

SuperGrafx has two VDCs which complicates analysis — Start with regular PC Engine games before tackling SuperGrafx titles

組み合わせ

他のMCPと組み合わせて10倍の力を

geargrafx-2 + filesystem

Export debug data and memory dumps for documentation

Dump the VDC sprite table and tile data to files for analysis.✓ コピーしました

ツール

このMCPが提供する機能

ツール	入力	呼び出すタイミング
pause/resume/step	none / step_count?	Control emulator execution
read_memory	address: int, size: int	Read emulator memory at any address
set_breakpoint	address: int	Set a CPU breakpoint
disassemble	address: int, count: int	Disassemble HuC6280 instructions
get_hardware_status	none	Get VDC, VCE, and PSG register states

コストと制限

運用コスト

APIクォータ: N/A — fully local
呼び出しあたりのトークン: 100–500 tokens per debug command
金額: Free and open source (MIT license)
ヒント: Use targeted reads instead of full memory dumps.

セキュリティ

権限、シークレット、影響範囲

認証情報の保管： N/A

データ送信先： Fully local — no network calls

トラブルシューティング

よくあるエラーと対処法

MCP server not responding

Ensure Geargrafx was built with MCP support. Check the default port is available.

確認： Test the HTTP endpoint

CD-ROM game won't load

Verify CUE file references correct BIN paths. Try converting to CHD format.

確認： Check CUE file contents match actual BIN filenames

SuperGrafx ROM crashes

Only a handful of SuperGrafx games exist. Verify the ROM is actually an SGX title, not a regular PCE ROM.

確認： Check ROM header

代替案

Geargrafx 他との比較

代替案	代わりに使う場面	トレードオフ
Gearboy	You want to debug Game Boy ROMs instead of PC Engine	Different console, same MCP-enabled emulator approach

その他

リソース

📖 GitHub の公式 README を読む

🐙 オープンな issue を見る

🔍 400以上のMCPサーバーとSkillsを見る