Alternatives to DOS

foxDOS

installs the D: device like any other DOS Atari
loads a bootable file named AUTORUN at startup
supports the standard DOS 2 file system
the supported sector size (128 or 256 bytes) is determined at the foxDOS compilation stage
foxDOS allows a file to be read by D:
supports BINARY LOAD function, e.g. XIO 40,#1,0,0, "D:FILE.EXE"
foxDOS fits entirely into pre-read sectors (boot sectors)
foxDOS does not set MEMLO, but only occupies the memory area $0700..$097F
foxDOS does not disable the ROM during transmission

limitations:

only one file can be read at a time, but it can be of any length
allows overwriting an existing file that fits in only one sector
other operations such as reading a directory, deleting, renaming, etc. are not supported

copy filename.obx disk\autorun.

dir2atr.exe -md -B foxdos.obx disk.atr disk\

MEMLO = $980, does not use $04xx,$05xx or $06x page
after loading, it automatically runs the program stored under the name "AUTO"
automatically configures itself to the appropriate sector size (128/256) of SD/ED/DD and DOS2 file system version (disk image size up to 16 MB)
also supports BiboDOS and TopDOS systems with 64/128 directory entries
allows you to overwrite existing files
supports BINARY LOAD function, e.g. XIO 40,#1,0,0, "D:FILE.EXE"
additional NOTE and POINT commands are included in the xBDext file (can be loaded automatically - rename to AUTO)

limitations:

only one file can be read at a time, but it can be of any length
other operations such as reading a directory, deleting, renaming, etc. are not supported

copy filename.obx disk\autorun.

dir2atr.exe -md -B xBootDOS.obx disk.atr disk\

A program for Windows with which you can create floppy disk images Atari 8-Bit ATR