Editing Atari DOS (section)

===MyDOS===
This DOS adds the ability to use sub-directories, and supports hard-drives.<ref>{{Cite book |last=Marslett |first=Charles |url=https://seriouscomputerist.atariverse.com/media/pdf/manual/MyDOS%204.50%20-%20Manual.pdf |title=MYDOS Version 4.50 |last2=Puff |first2=Robert |publisher=WORDMARK Systems |year=1988 |edition= |type=User Guide |format=PDF |quote=For Atari Home Computers.}}</ref><ref>{{Citation |title=Miscellaneous PD Disks: MyDos Disk Operating System Replacement, utilities |url=https://archive.org/details/a8b_misc_mydos45u |access-date=2024-09-14}}</ref><ref>{{Cite web |title=Atari 400 800 XL XE MyDOS 5.0 |url=https://www.atarimania.com/utility-atari-400-800-xl-xe-mydos-50_30965.html |access-date=2024-09-14 |website=www.atarimania.com}}</ref><ref name=":0">{{Cite web |last=Fox-1 |first=Sysop |title=Disk Formats Explained |url=https://atari.fox-1.nl/disk-formats-explained/ |access-date=2024-09-14 |website=THUNDERDOME – the ATARI site |language=en-US |quote=There is no real important difference in the special boot bytes on a MyDos disk and an Atari Dos Disk.}}</ref>

Published by Wordmark Systems, includes complete [[source code]] under [[copyleft license]], with an exception on distributing commercially only if it included in software or derived software made of it would cost less than $50.<ref>{{Cite web |title=MyDOS programs and tools |url=https://www.wordmark.org/mydos.html |access-date=2024-09-14 |website=www.wordmark.org}}</ref><ref>{{Cite web |title=Mathy's MyDOS page |url=https://www.mathyvannisselroy.nl/mydos.htm |access-date=2024-09-14 |website=www.mathyvannisselroy.nl}}</ref><ref name=":1">{{Cite web |title=ANTIC The Atari 8-bit Podcast: ANTIC Interview 393 - Charles Marslett, MYDOS and FastChip |url=https://ataripodcast.libsyn.com/antic-interview-393-charles-marslett-mydos-and-fastchip |access-date=2024-09-14 |website=ataripodcast.libsyn.com |language=en |quote=Charles Marslett wrote floppy disk and hard drive drivers for Percom, and was the creator of MYDOS, a disk operating system for the Atari 8-bit computers that offered support for double density sectors, subdirectories, and hard drives.}}</ref><ref>{{Cite web |title=Index of /~archive/atari/8bit/Dos/Mydos |url=https://websites.umich.edu/~archive/atari/8bit/Dos/Mydos/ |access-date=2024-09-14 |website=websites.umich.edu}}</ref>

There is number of free addons and extensions for MyDOS created by users.<ref>{{Cite web |last=Fox-1 |first=Sysop |date=2018-06-05 |title=Tag: mydos |url=https://atari.fox-1.nl/tag/mydos/ |access-date=2024-09-14 |website=THUNDERDOME – the ATARI site |language=en-US}}</ref><ref>{{Cite web |title=Atari 400/800/XL/XE Miscellaneous Software & Utilities - Chebucto Community Net |url=https://www.chebucto.ns.ca/Services/PDA/Atari8Misc.shtml |access-date=2024-09-14 |website=www.chebucto.ns.ca}}</ref><ref>{{Cite web |date=2016-02-03 |title=MyDOS |url=https://sourceforge.net/projects/mydos/ |access-date=2024-09-14 |website=SourceForge |language=en}}</ref><ref name=":2">{{Cite web |title=:: drac030.atari8.info |url=http://drac030.krap.pl/en-kmkjz-pliki.php |access-date=2024-09-14 |website=drac030.krap.pl |quote=Utility disk for the interface. ATR format, side A for MyDOS, side B for SpartaDOS (updated 19 I 2011).}}</ref>

==== MyPicoDOS ====
This is a fork of MyDOS, intended to be used as game laucher.<ref>{{Citation |last=Reichl |first=Matthias |title=HiassofT/MyPicoDOS |date=2024-03-27 |url=https://github.com/HiassofT/MyPicoDOS |access-date=2024-09-14}}</ref>