Editing Disk operating system (section)

==OS extensions==
*[[Commodore DOS]] is on 8-bit [[Commodore International|Commodore]] computers such as the [[Commodore 64]]. Unlike most other DOS systems, it is integrated into the disk drives, not loaded into the computer's own memory.
*[[Atari DOS]] is used by the [[Atari 8-bit computers]]. The Atari OS only offers low-level disk-access, so an extra layer called DOS can be booted from a floppy for higher level functions such as filesystems.<ref name=wilkinson/> Third-party replacements for Atari DOS include [[DOS XL]], [[SpartaDOS X|SpartaDOS]], [[MyDOS]], [[TurboDOS]], and [[Top-DOS]].
*[[MSX-DOS]] is for the [[MSX]] computer standard. The initial version, released in 1984, is MS-DOS 1.0 ported to [[Zilog Z80|Z80]]. In 1988, version 2 has facilities such as subdirectories, memory management, and environment strings. The MSX-DOS kernel resides in ROM (built-in on the disk controller) so basic file access capacity is available even without the command interpreter, by using [[BASIC]] extended commands.
*[[Disc Filing System]] (DFS) is an optional component for the Acorn [[BBC Micro]], as a kit with a disk controller chip, a ROM chip, and a few logic chips, to be installed inside the computer.
*[[Advanced Disc Filing System]] (ADFS) is a successor to Acorn's DFS.
*[[AMSDOS]] is for the [[Amstrad CPC]] computers.
*GDOS and G+DOS is for the [[+D]] and [[DISCiPLE]] disk interfaces for the [[ZX Spectrum]].