AmigaOS is a single-user operating system based on a preemptive multitasking microkernel (called Exec, originally developed by Carl Sassenrath) built for the Motorola 68000-based AMIGA home computer systems.
AmigaOS 1.0 was released with the first Amiga, the Amiga 1000, in 1985. Versions 1.1 consists mostly of bug fixes and, like version 1.0, was distributed for the Amiga 1000 only.
AmigaOS provides a disk operating system called AmigaDOS, a windowing system API called Intuition (mainly designed by RJ Mical) and a desktop environment called Workbench. The 1.x versions of AmigaOS’ Workbench used a blue and orange color scheme, designed to give high contrast on even the worst of television screens (the colors can be changed by the user). A command-line interface (CLI), called AmigaShell, is also integrated into the system, though it also is entirely window based.
Original AmigaOS lacked any built-in memory protection – and featured (many) Guru Meditations ;).