واجهة مستخدم رسومية
The first AmigaOS was introduced in 1985 and developed by Commodore International. It was nicknamed "Workbench" from the name of its Graphical user interface (GUI), due to an error of Commodore Marketing and Sales Department, which labeled the OS disk just with the name "Workbench Disk" and not with the correct name "AmigaOS Disk (Workbench)". The first versions of AmigaOS (1.0 and up to 1.3) are here indicated with the name of their original disks to preserve original custom.