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AmigaOS is the proprietary native operating system of the Amiga personal computer. Since its introduction with the launch of the Amiga 1000 in 1985 there have been four major versions and several minor revisions of the operating system. Initially the Amiga operating system had no strong name and branding, as it was simply considered an integral part of the Amiga system as a whole. Early names used for the Amiga operating system included "CAOS" and "AmigaDOS".〔(【引用サイトリンク】title=In the Beginning Was CAOS )〕 Another non-official name was "Workbench", from the name of the Amiga Desktop environment, which was included on a floppy disk named "Amiga Workbench". Version 3.1 of the Amiga operating system was the first version to be officially referred to as "Amiga OS" (with a space between "Amiga" and "OS")〔(【引用サイトリンク】title=Name of the Amiga Operating System )〕〔(【引用サイトリンク】title=AmigaOS 3.1 )〕 by Commodore, possibly inspired by Apple renaming the Mac operating system from "System" to "Mac OS". Version 4.0 of the Amiga operating system was the first version to be branded as a less generic "AmigaOS" (without the space).〔(【引用サイトリンク】title=Name of the Amiga Operating System )〕 What many consider the first versions of AmigaOS (Workbench 1.0 up to 3.0) are here indicated with the Workbench name of their original disks. ==Kickstart/Workbench 1.0, 1.1, 1.2, 1.3== Workbench 1.0 was released for the first time in October 1985. The 1.''x'' series of ''Workbench'' defaults to a distinctive 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). Version 1.1 consists mostly of bug fixes and, like version 1.0, was distributed only for the Amiga 1000. The entire Workbench operating system consisted of three floppy disks: ''Kickstart'', ''Workbench'' and ''ABasic'' by MetaComCo. The Amiga 1000 needed a ''Kickstart'' disk to be inserted into floppy drive to boot up. An image of a simple illustration of a hand on a white screen, holding a blue Kickstart floppy, invited the user to perform this operation. After the kickstart was loaded into a special section of memory called the writable control store (WCS), the image of the hand appeared again, this time inviting the user to insert the Workbench disk. ''Workbench'' version 1.2 was the first to support Kickstart stored in a ROM. A ''Kickstart'' disk was still necessary for Amiga 1000 models; it was no longer necessary for Amiga 500 or 2000, but the users of these systems had to change the ROMs (which were socketed) to change the ''Kickstart'' version. ''Workbench'' now spanned two floppy disks, and supported installing and booting from hard drive (assuming the Amiga was equipped with one), the name of the main disk was still named "Workbench" (which is also the user interface portion of the operating system). The second disk was the ''Extras'' disk. The system now shipped with ''AmigaBasic'' by Microsoft, the only software Microsoft ever wrote for the Amiga. ''Kickstart'' version 1.2 corrected various flaws and added AutoConfig support. AutoConfig is a protocol similar to and is the predecessor of Plug and Play, in that it can configure expansion boards without user intervention. ''Kickstart'' version 1.3 improved little on its predecessor, the most notable change being auto booting from hard drives. ''Workbench 1.3'', on the other hand, users can find several significant improvements to Workbench, including FFS a faster file system for hard disks storage which resolved the problem of old Amiga filesystem which wasted too much hard disk space due to the fact it could store only 488 bytes in any block of 512 bytes keeping 24 bytes for checksums. Many improvements were made to the CLI (command line interface) of Amiga which was now a complete text based Shell, named ''AmigaShell'', and various additional tools and programs. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AmigaOS versions」の詳細全文を読む スポンサード リンク
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