dm42

dm42 is a plugin for Claude Code from emaballarin/ccplugins. Its manifest loads nothing; the 2 skills it bundles cost 117 tokens per session together, scanned A, original, MIT.

A plugin for writing, reviewing, and debugging programs for HP-42S-family calculators, especially the SwissMicros DM42 and DM42n. It also covers Free42 and Plus42, which are compatible calculator software or emulators.

In plain words
What is it for?
Use it to create or inspect RPN calculator programs, convert program files, run them in the DM42 emulator, and check stacks, variables, flags, screens, and graphics.
Why use it?
Calculator programs have device-specific rules, and a text parser can silently drop invalid lines. Its documented workflow and emulator checks help catch program and display mistakes before using the code on a calculator.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Use it to create or inspect RPN calculator programs, convert program files, run them in the DM42 emulator, and check stacks, variables, flags, screens, and graphics.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add emaballarin/ccplugins
/plugin install dm42
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/emaballarin/ccplugins

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for dm42

README.md
[![agentmods](https://agentmods.dev/badge/plugins/emaballarin/ccplugins/dm42dev/github.svg)](https://agentmods.dev/plugins/emaballarin/ccplugins/dm42dev)
Your own site
<a href="https://agentmods.dev/plugins/emaballarin/ccplugins/dm42dev"><img src="https://agentmods.dev/badge/plugins/emaballarin/ccplugins/dm42dev/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for dm42

Your own site · 80×15
<a href="https://agentmods.dev/plugins/emaballarin/ccplugins/dm42dev"><img src="https://agentmods.dev/badge/plugins/emaballarin/ccplugins/dm42dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 2 skills cost 117 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

dm42 scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/dm42dev/.claude-plugin/plugin.json · 25 lines

What it actually says

{
    "name": "dm42",
    "version": "0.2.2",
    "description": "dm42 — write, review and debug HP-42S-family RPN programs, the SwissMicros DM42n first (also DM42, Free42, Plus42). /dm42:rpn (model-invoked) is the workflow and the verified reference: program-text rules, stack lift, flags, locals, menus, GETKEY vs GETKEY1, PIXEL/AGRAPH, the DM42 virtual variables and graphics modes, with a round-trip check that catches the lines the text parser silently drops. /dm42:setup (user-only) builds dm42sim: SwissMicros' own Free42 core, compiled as for the device, driven headless by an action script that returns JSON — screen text, PNG snapshots, stack and its depth, variables, flags, the Free42 Configuration switches, executed steps — whose cmd and text actions stop on any refusal. No hooks, no MCP.",
    "author": {
        "name": "Emanuele Ballarin",
        "email": "[email protected]"
    },
    "homepage": "https://github.com/emaballarin/ccplugins/tree/main/plugins/dm42dev",
    "repository": "https://github.com/emaballarin/ccplugins",
    "license": "MIT",
    "keywords": [
        "dm42",
        "dm42n",
        "swissmicros",
        "hp-42s",
        "free42",
        "plus42",
        "rpn",
        "calculator",
        "emulator",
        "programming"
    ]
}
Contents

What it installs

The manifest is a name and a version. 2 skills travel with it, and installing the plugin installs all of them — 117 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago Changed 3ad57ec6f4a7
  2. 10d ago First seen · 25 lines scan A 5c2a6f1973d2

Subscribe to this mod's changes

dm42 is a plugin published in the GitHub repository emaballarin/ccplugins (4 stars, last pushed 9d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-25.

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