A2 (operating system)

A2 (formerly named Active Object System (AOS),^[2] and then Bluebottle) is a modular, object-oriented operating system with features including automatic garbage-collected memory management, and a zooming user interface. It was developed originally at ETH Zurich in 2002.^[2] It is free and open-source software under a BSD-like license.

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Quick Facts Developer, OS family ...

A2
Developer	ETH Zurich
OS family	Oberon
Working state	Current
Source model	Open source
Initial release	2002; 23 years ago (2002)
Repository	gitlab.inf.ethz.ch/felixf/oberon
Platforms	IA-32, x86-64, ARM, Cell
Kernel type	Object-oriented
License	BSD-like ETH A2 License^[1]
Official website	gitlab.inf.ethz.ch/felixf/oberon

User interface

Bluebottle replaced the older Oberon OS's unique text-based user interface (TUI) with a zooming user interface (ZUI), which similar to a conventional graphical user interface (GUI). Like Oberon, though, its user interface supports a point and click interface metaphor to execute commands directly from text, similar to clicking hyperlinks in a web browser.

Features

A2's design allows developing efficient systems based on active objects which run directly on hardware, with no mediating interpreter or virtual machine. Active objects represent a combination of the traditional object-oriented programming (OOP) model of an object, combined with a thread that executes in the context of that object. In the Active Oberon implementation, an active object may include activity of its own, and of its ancestor objects.

A2 incorporates a minimalist design, implemented in a type-safe language with automatic memory management, combined with a set of primitives (at the level of programming language and runtime system) for synchronizing access to the internal properties of objects in competing execution contexts.

Above the kernel layer, A2 provides a set of modules providing unified abstractions for devices and services, such as file systems, user interfaces, computer network connections, media codecs, etc.

A2 (operating system)

History

User interface

Features

See also

References

External links

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