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Rather than specifying "Kickstart" or "Workbench", the updates were most often referred to as simply "AmigaOS".

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Along with this update came a change in the way people referred to the Amiga's operating system.

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For the programs that Petunia is unable to handle, such as most "bang the hardware" (using legacy Amiga hardware directly) Amiga games and Amiga demos, UAE can be used which can emulate different Amiga chipsets (OCS, ECS, AGA) as well.Īfter the demise of Commodore International, the later owners of the Amiga trademark granted a license to a German company called Haage & Partner to update the Amiga's operating system.

It gives OS4 backward compatibility to some extent, it will only run system friendly (following the OS3.x API without communicating directly with the classic Amigas' custom chipset) AmigaOS 3.x programs.

Petunia, a Motorola 68020 processor emulator with dynamic recompilation, also called just-in-time compilation ( JIT compilation), for PowerPC based Amigas.

The CLI and the GUI complement each other and share the same privileges.

AmigaDOS and AmigaShell: AmigaDOS is the disk operating system for the OS, whereas AmigaShell is the integrated Command Line Interface (CLI).

ExecSG was licensed to Hyperion Entertainment by Thomas and Hans-Jörg Frieden.

ExecSG, a preemptive multitasking kernel.

In OS4 the Kickstart is instead stored on the hard disk. Prior to version 4 of AmigaOS the Kickstart had been released mostly on a ROM (hardware included with the computer). The Kickstart contains many of the core components of the OS.

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It also includes some general purpose tools and utility programs such as a Notepad for typing text, MultiView for viewing images and Amigaguide documents, Unarc for unpacking Archives, a PDF reader, a number of small preferences programs for changing settings of the GUI and OS, among other programs. The Workbench is the GUI of OS4, a graphical interface file manager and application launcher for the Operating System. Description ĪmigaOS 4 can be divided into two parts: the Workbench and the Kickstart.

Hyperion has assured the Amiga community that it will continue the development and the distribution of AmigaOS 4.x (and beyond), as it has done since November 2001. reached a settlement agreement where Hyperion is granted an exclusive right to AmigaOS 3.1 and market AmigaOS 4 and subsequent versions of AmigaOS (including AmigaOS 5 without limitation). On 30 September 2009, Hyperion Entertainment and Amiga, Inc.

During the judicial procedure (between Hyperion and Amiga, Inc.), OS4 was still being developed and distributed. However this is both unofficial and unsupported as of today, and very incomplete, especially regarding drivers. Also, a third party bootloader, known as the "Moana", was released by Acube on torrent sites it allows installation of the Sam440ep version of OS4 to Mac Mini G4s. The Italian computer company ACube Systems has announced Sam440ep and Sam440ep-flex motherboards, which are AmigaOS 4 compatible. Nevertheless, AmigaOS 4.0 was released commercially for Amigas with PowerUP accelerator cards in November 2007 (having been available only to developers and beta-testers until then). terminated the contract with Hyperion Entertainment to produce or sell AmigaOS 4.

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During the five years of development, purchasers of AmigaOne machines could download pre-release versions of AmigaOS 4.0 from Hyperion's repository as long as these were made available.