Open source. Under active development.

pTOS — Portable TOS

Classic roots.
New horizons.

pTOS is a portable, open-source, TOS-compatible operating system derived from EmuTOS. It preserves the familiar GEM environment while extending the architecture beyond classic Atari hardware, targeting m68k, ARM and x86-64 systems.

The project is under active development.

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pTerry, an orange pterodactyl with one wing raised and a skeptical expression, saying ‘I’m not a dinosaur.’ — A little prehistoric. A lot of possibility.

The direction

Familiar foundations.
Room to explore.

Classic GEM at heart. A shared, portable architecture ahead. Work spans m68k, ARM and x86-64; support varies by target, and ports and subsystems are still evolving.

m68k ARM x86-64

Building the foundations

Subprojects

Tools, libraries and compatibility work that help the pTOS ecosystem grow.

Subproject

ParaTos

Run compatible m68k TOS command-line programs through CPU emulation and native system-call translation.

Explore ParaTos

Subproject

pTOS toolchain

GCC, GNU Binutils and a C SDK for pTOS applications and freestanding kernels on m68k, ARM and x86-64.

Explore pTOS toolchain

Subproject

libcmini port

Extending the small-footprint Atari C library with the startup code and bindings needed by native pTOS programs.

Explore libcmini port

Made for GEM

Related apps

Classic ideas and new tools, taking shape alongside pTOS.

Related app

RCS

Porting and developing the Resource Construction Set: a native editor for GEM dialogs, menus, alerts and icons.

Related app

TypeShelf

A Font Book style viewer for GEM, with family browsing, samples, character previews and scalable-font installation.

Explore TypeShelf