# Johnny Castaway for macOS <img src="jc_island.webp" alt="Johnny Castaway on his island" width="400" style="display: block; margin: 0 auto;"> A native Swift recreation of **Screen Antics: Johnny Castaway** — the classic 1992 Sierra On-Line / Dynamix screensaver — for modern macOS. Johnny lives on his tiny desert island, builds his raft over an 11-day story arc, fishes, gets visited by mermaids, and generally never quite escapes. [Github](https://github.com/d4rkwyng/johnny-castaway-mac) > **You must supply the original game files.** The artwork and animation scripts are still copyrighted by Sierra/Dynamix and are **not** included. You provide two resource files — `RESOURCE.MAP` and `RESOURCE.001` — from an original copy of the screensaver (they're inside the 2005 re-release installer; the [README](https://github.com/d4rkwyng/johnny-castaway-mac#you-must-supply-the-original-game-files) walks through extracting them). Launch the app once, drop them in, and the screensaver is provisioned too. ### Features - From-scratch Swift port of the reverse-engineered Dynamix engine — all 41 TTM animation scripts play to completion, with the ADS scene scheduler, walking, and the full 11-day story progression - The original 640×480 pixel art, crisply scaled on Retina displays - Ships as both a `.saver` screensaver bundle (Sonoma+ lifecycle handled) and a windowed player app with debug keys — pause, frame-step, 0.25×–50× speed, day skip, date/time override for holidays and night scenes - Sound playback when the original WAV samples are present - **No Sierra assets bundled** — you supply RESOURCE.MAP / RESOURCE.001 from an original copy (they're inside the 2005 re-release installer); the app imports them on first launch and provisions the screensaver too - Byte-identical resource decoding verified against the reference C engine; story choreography locked by invariant tests and million-tick soak runs ### Download Requires macOS 14 or later. Signed and notarized. ```sh brew install --cask d4rkwyng/tap/johnny-castaway ``` installs both the app and the screensaver (`johnny-castaway-saver` for the saver alone). Zips on [Releases](https://github.com/d4rkwyng/johnny-castaway-mac/releases). ### Media Johnny's 11-day story arc — day 1 washed ashore, fishing by day 3, raft nearly done by day 9 — plus the holiday and night scenes the original hid for whoever left their PC on at the right time. [![[jc_day1.webp|200]]](<jc_day1.webp>)[![[jc_island.webp|200]]](<jc_island.webp>)[![[jc_raft.webp|200]]](<jc_raft.webp>) [![[jc_night.webp|200]]](<jc_night.webp>)[![[jc_halloween.webp|200]]](<jc_halloween.webp>)[![[jc_christmas.webp|200]]](<jc_christmas.webp>) ### Release Notes - **0.2.5 (11 June 2026)** - Welcome screen for the first-run resource import - **0.2.2–0.2.4 (11 June 2026)** - Saver audio muted when running as the Sonoma wallpaper companion - Engine stops when off screen; drag-and-drop first-run import - Combined app+saver release zip; silent-saver fix - **0.2.0–0.2.1 (10 June 2026)** - Developer ID signed + notarized releases, Homebrew tap - About panel, version stamped from the git tag - Story choreography invariant tests; playback speed ladder (0.25×–50×) - **0.1.0 (10 June 2026)** - First release: complete engine — resource layer (RLE + LZW, byte-identical vs. the reference), TTM interpreter, ADS scheduler, island/walking/story, sound, `.saver` bundle ### Credits Stands on the shoulders of the reverse-engineering community: [jc_reborn](https://github.com/jno6809/jc_reborn) (primary reference, GPL-3 — inherited license), [JCOS](https://github.com/nivs1978/Johnny-Castaway-Open-Source), [castaway](https://github.com/xesf/castaway), and [Aerial](https://github.com/JohnCoates/Aerial) for the macOS saver lifecycle lore. Original game © 1992–1993 Sierra On-Line / Dynamix — no original assets included; not affiliated with Sierra, Dynamix, or Activision.