Atari TOS (The Operating System) is a pivotal software that defined the Atari ST series of personal computers. Over its lifecycle, TOS evolved through several versions, each offering enhancements in performance, functionality, and compatibility. In this video, we’ll explore the official Atari TOS versions, delve into custom TOS versions created by indie developers, and highlight the community's efforts in developing the open-source EmuTOS. All TOS versions have been tested on real hardware using the SidecarTridge® TOS Emulator.

You can find more information https://sidecartridge.com