Zelda Js Sms

Zelda-JS → Sega Master System port

A faithful, **playable** port of [Matthew-SA/zelda-js](https://github.com/Matthew-SA/zelda-js) (a JavaScript clone of the NES classic *The Legend of Zelda*) to the **Sega Master System**, written in C with **devkitSMS** (sverx's SMSlib) and **SDCC**, following the [sega-master-system-skill-for-claude](https://github.com/haroldo-ok/sega-master-system-skill-for-claude) workflow.

The ROM

`zelda-sms.sms` (112 KiB) — runs on real SMS hardware, a flash cart, or any SMS/Game Gear emulator (Emulicious, Fusion, etc.).

Controls

Action	SMS pad
Move Link	D-Pad
Swing sword	Button 1
Start / restart	START

What's ported

• The complete overworld. The original game's full 16×8-screen Hyrule is present and explorable. The source 12288×4224 overworld art is downsampled (each NES 48 px "screen-tile" → one SMS 16×16 metatile of four 8×8 tiles), quantised to the SMS master palette, deduplicated (242 background tiles, 90 metatiles) and stored in ROM banks.
• Per-tile collision derived directly from the original overworld-collision.png (walkable / tree-rock wall / water).
• Link: 4-direction walk, walk animation, sword swing in each direction, hit knockback + invincibility blink.
• Enemies (octorok-style): spawn on open ground (like the JS scanGrid/openSpaces), wander tile-to-tile, hurt Link, and die to the sword with a count of kills.
• HUD: heart life bar (red full / grey empty) and a live minimap of the 16×8 screen grid with Link's position marked.
• Screen transitions between every overworld screen, a title screen and a game-over screen with restart.

Architecture

The SMS has no framebuffer, a tile/sprite VDP (256×192, two 16-colour palettes, ≤64 sprites), and 8 KiB RAM — nothing like a canvas. The port keeps the clean game logic and rewrites the platform layer:

Zelda-JS (JS/Canvas)	SMS port (C/devkitSMS)