SEMATORPLAY. REVISIT. ENHANCE.The Atari ST games you love. A view you haven’t seen.
Wider worlds. Smoother action. That unmistakable CRT glow.
Rediscover your collection with enhancements you control.
Windows + Linux · Your own disks · No TOS ROM needed
Vroom running in SemaTor 1.1.564. Wider gameplay, with the original dashboard kept in view. Games are not included.
Version 1.1.601 adds 18 game profiles and per-game display controls on supported paths, alongside SemaDrive and shared-menu improvements. SimCity gains independent map-camera easing and optional MIDI playback from your files. Experimental large maps remain limited.
See what changed →ANOTHER MACHINE. ANOTHER WORLD.
Meet the Mega Drive side of SemaTor. Authored widescreen gameplay, original cartridge soundtracks, and a home with its own atmosphere.
Step into SemaDrive ↗Race beyond the old screen edges. Follow sharper, smoother scrolling. Choose the warmth of a CRT or a clean pixel picture. Set up each game the way you want to play it.
Game-specific enhancements open up supported playfields instead of stretching the picture. Use 16:9, 21:9 or up to 32:9 where the game allows it; FIT adapts to the available space within each profile’s limits.
Browse current game enhancements ↗Dedicated smooth-motion enhancements add intermediate movement in supported games, including scrolling backgrounds in Xenon and Xenon 2. Frame generation offers another motion option; results depend on the game and settings.
Explore Xenon 2 ↗Wrap the game in a CRT bezel. Tune scanlines, phosphor, glow and curvature, or choose a clean picture. Super ST colour adds smoother shading while keeping outlines sharp.
Give bright highlights more room to shine on a compatible HDR display. Adjust the picture to your screen with the Vulkan renderer’s HDR controls.
Predict the next game picture early to reduce the delay introduced by frame generation. SemaTor measures the cost and uses run-ahead when it fits the frame budget.
Save states with previews, rewind and per-game settings make it easier to pick up where you left off. F11 brings up your session; F12 puts the setup at your fingertips.
Enhancements are optional. Widescreen and dedicated smooth motion depend on the game and disk edition; HDR and some frame-generation options also depend on your renderer, GPU and display.
The ship, the scenery, the soundtrack. Rediscover your collection with game-specific enhancements and a picture you can make your own.
This capture shows the CRT presentation. Try smooth motion in-game to see the scrolling in action.
Find your game’s enhancements ↗Android testing brings SemaTor to your phone and handheld. Find the APK, share feedback and follow development on Discord.
The Vertical enhancement opens up the scrolling playfield while keeping the original HUD. GPU Smooth Motion adds fractional movement to the scenery and supported objects.
Actual Android gameplay captured in the 1.1.582 phone test. Still images show the extended view; try the game to judge motion.
Browse current enhancements ↗The latest build adds RoboCop layouts for 16:9, 21:9 and 32:9, a bottom-only HUD and clearer damage feedback. Shadow of the Beast I disk music can also be imported into the jukebox.
Get the Android testing APK on Discord ↗Desktop public preview · Version 1.1.601
18 new game profiles, SimCity map-camera easing and user-file MIDI playback, plus input and CRT no-bezel fixes. See what’s new →
Download, add your game disks and play. Choose enhancements per game, and keep your saves and settings between sessions.
Use the signed in-app updater. If the older Windows interface is unreadable, extract the new ZIP over your installation, preserving Games, Media, User and Add-ons. Older updater helpers may require a full ZIP update.
The desktop app, SemaOS and its tools are included. Supply your own game disks. No commercial games or Atari TOS ROMs are bundled. The Android testing APK is available on SemaTor Discord. It is distributed separately from these desktop downloads.
Report a problem on GitHub or join the Discord. Include the version, operating system, disk edition and steps to reproduce. Do not attach game disks or ROMs.
Browse cover art, search your collection and keep different disk editions together under one game. SemaOS is the built-in interface inside SemaTor, a Windows and Linux app. Choose its retro desktop or the classic library in Settings.
Violet, teal, amber or crimson accents. A gradient, the retro scene or your own wallpaper. Choose icon and label styles and tune the size of your desktop.
Green desktop. Light windows. Matching icons and a monospace system font. Pick a fine pattern or a plain green background.
Move between windows, search with Find and use gamepad focus to reach the controls. Prefer the classic library? Choose it in Settings.
BUILD SOMETHING OF YOUR OWN
Make ST and STE games with editable starters, scrolling worlds, pixel art, music, samples and native code. Explore the connected desktop tools and take a project from its first room to a playable disk.
Explore Creator tools ↗These are working apps inside SemaOS. Maker, SemaPaint and Hardware Check show the 1.1.601 interface; the other captures show earlier versions. Visit the Creator tools page for the current connected workflow.
Create / SemaSynthCompose patterns and songs, shape YM instruments, work with digi and Quartet samples, and sequence an STE sample track. Send supported music and effects into Maker.
Built-in Studio demo song.
Create / SemaPaintDraw on a 320 × 200 ST canvas with ST or STE palettes. Zoom to individual pixels with the pixel grid, then use selections, transforms and undo. Add a new palette colour separately from changing a used entry. Open supported artwork from a game disk and save the edited picture into a separate disk copy.
Original Moonlight Station artwork in SemaPaint, with indexed colours, layers and animation frames.
Create / MakerBuild ST and STE games with editable starters, rooms, sprites, event rules and SemaBASIC. Add artwork, sound, paths and effects, then build and playtest a native game disk. Intro projects remain available too.
Moonlight Station: an original platform-game project in the 1.1.601 Maker workspace.
Create / Program LabEdit assembly, assemble a program and run it from a disk. Syntax colours, search, undo and saved source files make the desktop a place to build things.
Built-in example program.
Explore / Disk WorkshopBrowse a disk image, open its files, work with folders and prepare a new ST disk. Move between the workshop and the apps that understand each file.
A demo disk with editable artwork and a README.
Explore / Hardware CheckRun a disk against the available machine configurations and inspect the results. A live test helps you see the program as it runs.
Moonlight Station after a 30-second emulated run with the 512 KB RAM boundary enforced.
Vroom (1.1.564), Xenon 2 (1.1.563) and Vertical Xenon (Android phone test 1.1.582) are actual gameplay captures. Still images show presentation, not motion or HDR output. Desktop and creative-app captures come from the running Linux interface; their versions and demo content are recorded in the manifest. Game artwork belongs to its respective owners.
Capture details ↗
Atari ST enhancements
Mega Drive enhancements