DOS System Disks
DOS  1.0   24-Sep-1979 (C) 1979 Atari Corp. DOS_1.LZH  ±5Kb	* For Atari 400/800 and all XL/XE's * Written for the 810 diskdrive, so only single-density support * First DOS ever for the 8-bits
DOS  2.0D (C) 1980 Atari Corp. DOS20D.LZH  ±7Kb	* 400/800 and XL/XE's * Supports only double-density * Works as standard DOS 2.0
DOS  2.0S   SuperDup Atari 1980, 1981 DOS2SUPR.LZH  ±7Kb	* Modified by David Young * SuperDup option
DOS  2.0S   UltraDupe Atari 1980, 1985 DOS2ULTR.LZH  ±7Kb	* Modified by B. Kershaw * "Duplicate Disk" changed to "UltraDupe"
DOS  2.1C (C) 1980 Atari Corp. DOS21C.LZH  ±9Kb	* Modified by L.J. Silver * Comes up with a green dup-menu
DOS  2.1P (C) 1980 Atari Corp. DOS21P.LZH  ±7Kb	* Looks like DOS 2.0 * No further info available
DOS  2.5   256Kb SAG 1987 DOS256KB.LZH  ±28Kb	* For expanded Atari XL's with 256Kb memory * Single and enhanced density operation * Uses 2 ramdisks to acces the whole 192Kb * Works as standard DOS 2.5 * Ramdisk source-code is included
DOS  2.5a   Rambo 256Kb DOS25ARB.LZH  ±28Kb	* For Atari XL's with 256Kb Rambo memory upgrade * Inits 2 single density ramdisks (D7: , D8:) * Works as standard DOS 2.5
DOS  2.5F Atari 1983 DOS25F.LZH  ±16Kb	* Extended version of DOS 2.0 * Orange dup-menu * Hex-Dec conversion * Diskdrive RPM check
DOS  2.5+   1986 Atari DOS25PLS.LZH  ±42Kb	* Modified DOS 2.5 by T. Patrick * With ramdisk * Set-up features * DOS 3 to DOS 2 copier * Hexacon
DOS  2.6F (C) 1983 Atari DOS26F.LZH  ±9Kb	* Modified for Atari 800 use * Not DOS 2.x compatible * Dup has black background
DOS  2.8F Atari 1983 DOS28F.LZH  ±9Kb	* Modified by E.T. Horst * Has yellow dup-screen
DOS  3 (C) Atari 1983 DOS3.LZH  ±27Kb	* XL/XE only * Very uncompatible * Feature to acces DOS 2 disks
DOS  4.0 (C) Atari Inc. 1984 DOS4.LZH  ±40Kb	* Also known as "QDOS" or "Antic-DOS" * Written by Atari, released by Antic * Menu driven * XL/XE only * D0: - D9: * Supports drive redirection * Very configurable * Single, enhanced, double, and quad density * Lacks compatibility with any DOS * Feature to read DOS 2 and DOS 3 disks
DOS XE  1.00 (C) Atari corp. 1988 DOSXE100.LZH  ±24Kb	* Menu driven * XL/XE only * Subdirectory support * Supports time/date stamp * Released for the XF551 diskdrive * Compatible with nothing except itself * DOS 2.x acces option
DOS XL  2.20 (C) OSS 1983 DOSXL22.LZH  ±49Kb	* Commandline driven * Compleet version * Menu     * ClrDsk * Config     * Do * DupDbl     DupDsk * Init     * InitDbl * RS232     * SDCopy * RS232Fix     * Copy * XLTrans     * RVDosXL * MPP61     * Assembly system equates
DOS XL  2.35 I1   2.30 (C) OSS 1983 DOSXL235.LZH  ±41Kb	* Commandline driven * All utilities included * IndusGT synchromesh engager
HappyDOS  II+/D S. Dorndorf 1985 HAPPYDOS.LZH  ±15Kb	* Driven by typing abbreviated commands * Uses DOS 2.x compatible format * BASIC-Init listing included (writes actual DOS) * DOC's partial English and Dutch
MachDOS  3.7a Stace 1985 MACH37A.LZH  ±45Kb	* DOS 2.x compatible * Highspeed SIO * Supports single, enhanced, double, and quad density * Ramdisk * Back-up and Restore utilities
MyDOS  v3.013 Charles Marslett MYDOS301.LZH  ±8Kb	* System files only * All densities, up to 16MB partitions * Menu driven * DOS 2.x compatible formats
MyDOS  v4.50 Charles Marslett & Bob Puff 1988 MYDOS450.LZH  ±10Kb	* System files only * All densities, up to 16MB partitions * Ramdisk support * Menu driven * DOS 2.x compatible formats
MyDOS  v4.50D Charles Marslett & Bob Puff 1988 MYDOS45D.LZH  ±10Kb	* ABBUC version in German language * System files only * All densities, up to 16MB partitions * Ramdisk support * Menu driven * DOS 2.x compatible formats
MyDOS  v4.51 Charles Marslett & Bob Puff 1988 MYDOS451.LZH  ±187Kb	* All densities, up to 16MB partitions * Ramdisk support * Menu driven * DOS 2.x compatible formats * Manual, sourcecode and A65 assembler included
SmartDOS  6.1D John Chenoweth & Ron Bieber 1984 SMART61D.LZH  ±9Kb	* Originally designed for the RANA diskdrives * DOS 2.x compatible * D1: - D4: * Sector copier * Test sectors * Speed check * Print directory
SuperDOS  5.1 SUPDOS51.LZH  ±34Kb	* DOS 2.x compatible * D1: - D4: (D8:) * 400/800 16Kb and XL/XE * RamDisk on 800 if Axalon compatible * 1 Memory bank used to swap SDUP on 800 * Highspeed SIO for US-Doubler compatible and SuperMax * Supports single, enhanced, double, and quad density
Topdos  1.5 R. K. Bennett 1985 TOPDOS15.LZH  ±31Kb	* DOS 2.x compatible * D1: - D8: * XL/XE only * Support for Happy drives * Single, Enhanced, Double and Quad density * Drivers for several memory upgrades
TurboDOS  2.0 EX H. Barth & F. Bruchhhaeuser M. Reitershan Computertechnik 1989 TUR20EX.LZH  ±65Kb	* Masterdisk to create personalized version(s) * Driven by typing abbreviated commands * D1: - D4: (D8:) * Supports several types of ramdisks * XL/XE only * DOS 2.x compatible mode * Supports Turbo1050, Happy, Speedy, XF551 and USD highspeed * Several utils included