Comparison of DOS operating systems

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This article details various versions of DOS-compatible operating systems.

Historical and licensing information[edit]

Originally MS-DOS was designed to be an operating system that could run on any computer with a 8086-family microprocessor. It competed with other operating systems written for such computers, such as CP/M-86 and UCSD Pascal. Each computer would have its own distinct hardware and its own version of MS-DOS, a situation similar to the one that existed for CP/M, with MS-DOS emulating the same solution as CP/M to adapt for different hardware platforms. So there were many different original equipment manufacturer (OEM) versions of MS-DOS for different hardware. But the greater speed attainable by direct control of hardware was of particular importance, especially when running computer games. So very soon an IBM-compatible architecture became the goal, and before long all 8086-family computers closely emulated IBM hardware, and only a single version of MS-DOS for a fixed hardware platform was all that was needed for the market. This specific version of MS-DOS is the version that is discussed here, as all other versions of MS-DOS died out with their respective systems. One version of such a generic MS-DOS (Z-DOS) is mentioned here, but there were dozens more. All these were for personal computers that used an 8086-family microprocessor, but which were not IBM PC compatible.

Name Creator Current code owner-maintainer License First public release date
86-DOS 0.42 Seattle Computer Products No longer supported Proprietary 1981-02-25
86-DOS 1.0 Seattle Computer Products No longer supported Proprietary 1981-04-28
PC DOS 1.0 IBM No longer supported Proprietary 1981-08-12
PC DOS 1.1 IBM No longer supported Proprietary May 1982
PC DOS 2.0 IBM No longer supported Proprietary March 1983
PC DOS 2.1 IBM No longer supported Proprietary October 1983
PC DOS 3.0 IBM No longer supported Proprietary August 1984
PC DOS 3.1 IBM No longer supported Proprietary 1985
PC DOS 3.2 IBM No longer supported Proprietary 1986
PC DOS 3.3 IBM No longer supported Proprietary 1987
IBM DOS 4.0 (called PC DOS 4.0) IBM No longer supported Proprietary 1988
IBM DOS 5.0 (called PC DOS 5.0) IBM No longer supported Proprietary 1991
PC DOS 6.1, PC DOS 6.3 IBM No longer supported Proprietary 1993
PC DOS 7.0 (revision 0) IBM No longer supported Proprietary 1995
PC DOS 2000
(PC DOS 7.0 revision 1)
IBM No longer supported Proprietary 1998
PC DOS 7.10 IBM IBM Proprietary 2003
MS-DOS 1.25[1] Microsoft No longer supported Proprietary 1982
Z-DOS 1.25 OEM Zenith No longer supported Proprietary May 1982
MS-DOS 2.0 (first version with name of "MS-DOS") Microsoft No longer supported Proprietary March 1983
MS-DOS 2.11 Microsoft No longer supported Proprietary December 1983
MS-DOS 3.0 Microsoft No longer supported Proprietary 1984
MS-DOS 3.1 Microsoft No longer supported Proprietary 1984
MS-DOS 3.2 Microsoft No longer supported Proprietary 1986
MS-DOS 3.3 Microsoft No longer supported Proprietary 1987
MS-DOS 4.0 Microsoft No longer supported Proprietary 1988
MS-DOS 5.0 Microsoft No longer supported Proprietary 1991
MS-DOS 6.0 Microsoft No longer supported Proprietary 1993
MS-DOS 6.20 Microsoft No longer supported Proprietary 1993
MS-DOS 6.21 Microsoft No longer supported Proprietary 1994
MS-DOS 6.22 Microsoft No longer supported Proprietary 1994
MS-DOS 7.0 (Windows 95A) Microsoft No longer supported Proprietary 1995
MS-DOS 7.10
(Windows 95 OSR 2, Windows 95 OSR 2.5, Windows 98, and Windows 98 SE)
Microsoft No longer supported Proprietary 1996
MS-DOS 8.0 (Windows Me and later Windows versions)[2] Microsoft Microsoft Windows[3] Proprietary 2000
DOS Plus 1.2 & 1.2a Digital Research No longer supported Proprietary 1985
DOS Plus 2.1 Digital Research No longer supported Proprietary 1986
DR DOS 3.31-3.35 Digital Research No longer supported Proprietary 1988
DR DOS 3.40-3.41 Digital Research No longer supported Proprietary 1989
DR DOS 5.0 Digital Research No longer supported Proprietary 1990
DR DOS 6.0 Digital Research No longer supported Proprietary 1991
Novell DOS 7 Novell No longer supported Proprietary 1993
Caldera OpenDOS 7.01 Caldera, Inc.; Caldera UK, Ltd. Not officially supported;
A derivative, Enhanced DR-DOS, is maintained by Udo Kuhnt
Free non-commercial use 1997
Caldera DR-OpenDOS 7.02 Caldera, Inc.; Caldera UK, Ltd. No longer supported Free non-commercial use 1997
Caldera DR-DOS 7.02 Caldera, Inc.; Caldera UK, Ltd. No longer supported Proprietary 1998
Caldera DR-DOS 7.03 Caldera Thin Clients, Inc.; Caldera UK, Ltd;
Lineo, Inc.
DRDOS, Inc. Proprietary 1999 (pre-released in 1998)
DR-DOS 8.0 DeviceLogics No longer supported Proprietary 2004
DR-DOS 8.1 DRDOS, Inc. No longer supported[4] Proprietary 2005
FreeDOS 1.0 Jim Hall et al. The FreeDOS Project GPL 2006
FreeDOS 1.1 Jim Hall et al. The FreeDOS Project GPL 2 January 2012
PTS-DOS 32 PhysTechSoft[5] PhysTechSoft Proprietary 1991
PTS-DOS 2000 PhysTechSoft PhysTechSoft Proprietary  ?
PTS-DOS 2000 PRO PhysTechSoft PhysTechSoft Proprietary  ?
ROM-DOS Datalight Datalight Proprietary 1989
DIP DOS 2.11 Atari Corporation No longer supported Proprietary 1989

Technical specifications[edit]

Name Hard drive: partition size max Native support:
File systems
Native support:
floppy capacities 3.5"
Native support:
floppy capacities 5.25"
Native support:
floppy capacities 8.0"
Integrated disk compression utility Native support:
long file names
86-DOS 0.42-1.0 n/a FAT12;
(CP/M 2 through RDCPM)
n/a NorthStar 87.5 KB; Cromemco 90 KB Cromemco/Tarbell 250.25 KB; Tarbell 616 KB; Tarbell 1232 KB[6] No No
MS-DOS 1.25 n/a FAT12 n/a 160 KB; 320 KB 250.25 KB[7] No No
MS-DOS 2.0-2.11 16 MB[citation needed] FAT12 n/a 160 KB; 180 KB; 320 KB; 360 KB 250.25 KB;[7][8][9] 500.5 KB;[7][8][9] 616 KB;[8][9] 1232 KB[7][8][9] No No
MS-DOS 3.0 32 MB FAT12, FAT16 n/a 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
MS-DOS 3.1 32 MB FAT12, FAT16 n/a 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
MS-DOS 3.2 32 MB FAT12, FAT16 720 KB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
MS-DOS 3.3 32 MB FAT12, FAT16 720 KB; 1.44 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
MS-DOS 4.0 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
MS-DOS 5.0 2 GB FAT12, FAT16, FAT16B 720 KB, 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
MS-DOS 6.0 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a DoubleSpace No
MS-DOS 6.20 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a DoubleSpace No
MS-DOS 6.21 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
MS-DOS 6.22 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a DriveSpace No
MS-DOS 7.0 (Windows 95A) 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a DriveSpace No
MS-DOS 7.1 (Windows 95B/OSR2, Windows 95C/OSR2.5, Windows 98, and Windows 98SE) 124.55 GB with FAT32[10] FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a DriveSpace for versions of Windows 95, none for Windows 98 No
MS-DOS 8.0 (Windows Me and later Windows versions)[2] 124.55 GB with FAT32[10] FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 1.0 n/a FAT12 n/a 160 KB n/a No No
PC DOS 1.1 n/a FAT12 n/a 160 KB; 320 KB (double-sided) n/a No No
PC DOS 2.0-2.1 16 MB FAT12 n/a 160 KB; 180 KB; 320 KB; 360 KB n/a No No
PC DOS 3.0 32 MB FAT12, FAT16 n/a 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 3.1 32 MB FAT12, FAT16 n/a 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 3.2 32 MB FAT12, FAT16 720 KB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 3.3 32 MB FAT12, FAT16 720 KB; 1.44 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 4.0 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 5.0 2 GB FAT12, FAT16, FAT16B 720 KB, 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 6.1 (early version) 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
PC DOS 6.1 with Compression / PC DOS 6.3 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a SuperStor No
PC DOS 7.0 / PC DOS 2000 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 1.86 MB (XDF), 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB, 1.54 MB (XDF) n/a Stacker No
PC DOS 7.10  ? FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 1.86 MB (XDF), 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB, 1.54 MB (XDF) n/a Stacker (not on FAT32) No
DOS Plus 1.2-2.1 32 MB FAT12, FAT16, CP/M-86 Apricot 315 KB;[11] (720 KB[12]) 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB; Acorn 640 KB; Acorn 800 KB;[13] CP/M 320 KB n/a No No
DR DOS 3.31-3.35 2 GB[citation needed] FAT12, FAT16, FAT16B 720 KB; 1.44 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB n/a No No
DR DOS 3.40-3.41 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) No No
DR DOS 5.0 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) No No
DR DOS 6.0 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) SuperStor No
PalmDOS 1 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) SuperStor No
Novell DOS 7 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Stacker No
OpenDOS 7.01 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Stacker No
DR-OpenDOS 7.02 2 GB FAT12, FAT16, FAT16B 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Stacker No
DR-DOS 7.02 2 GB FAT12, FAT16, FAT16B, (FAT32 in FDISK only) 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Stacker Partial (COMMAND.COM and LONGNAME only)
DR-DOS 7.03 2 GB FAT12, FAT16, FAT16B, (FAT32 in FDISK only) 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Stacker Partial (COMMAND.COM and LONGNAME only)
DR-DOS 7.04-7.05  ? FAT12, FAT16, FAT16B, FAT32 (non-bootable) 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Stacker (not on FAT32) Partial (COMMAND.COM and LONGNAME only)
DR-DOS 7.06-7.07  ? FAT12, FAT16, FAT16B, FAT32 (bootable) 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Stacker (not on FAT32) Partial (COMMAND.COM and LONGNAME only)
DR-DOS 8.0  ? FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB (243 KB[14]) Supported (not on FAT32) Partial (COMMAND.COM only)
DR-DOS 8.1  ? FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 360 KB; 1.2 MB n/a No No
FreeDOS 1.0 2 TB[citation needed] FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 360 KB; 1.2 MB n/a  ? No
FreeDOS 1.1 2 TB[citation needed] FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 360 KB; 1.2 MB n/a  ?  ?
PTS-DOS 32  ? FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 360 KB; 1.2 MB n/a No No
PTS-DOS 2000  ? FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 360 KB; 1.2 MB n/a No No
PTS-DOS 2000 PRO  ? FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 360 KB; 1.2 MB n/a No No
Datalight ROM-DOS  ? FAT12, FAT16, FAT16B, FAT32 720 KB; 1.44 MB, 2.88 MB 360 KB; 1.2 MB n/a No Yes
DIP DOS n/a FAT12 n/a n/a n/a No No

See also[edit]

References[edit]

  1. ^ Conner, Doug. "Father of DOS Still Having Fun at Microsoft". Micronews. 
  2. ^ a b MS-DOS 8.0 has most of the functionality of prior versions, but with significant losses of usability, e.g., the loss of FORMAT /S command, that can be substituted by formatting HDD/FDD and then copying IO.SYS from CD-ROM boot A: image, as first ever file onto drive; loss of SYS A: (or SYS B:) command for floppies, that can be substituted too in the same way as FORMAT /S; inability to boot to a command prompt without substitution/modification of IO.SYS (other than CD-ROM boot version) and COMMAND.COM. For purpose of booting from C: drive, an unmodified IO.SYS from simulated A: boot diskette image, that is placed on Windows Me OEM CD-ROM, from which that CD boots, can be used, and English COMMAND.COM can be modified by replacing in this file at hex offset 00006510h byte 75h by byte EBh, or substituted by (now Freeware) 4DOS http://www.jpsoft.com/download.htm
  3. ^ While Windows Me may be unsupported and end-of-life, a version of its underlying DOS is included with Windows XP. When one formats a floppy in Windows XP and selects "Create an MS-DOS startup disk", the floppy is formatted with a DOS version that identifies itself as "Windows Millennium Version 4.90.3000".
  4. ^ DR-DOS 8.1 was pulled from the market after it was discovered that 8.1 code had been lifted from FreeDOS in violation of the GPL license.
  5. ^ PhysTechSoft
  6. ^ http://www.86dos.org/downloads/86DOS_FILES.ZIP, A ZIP file containing most of the files from 86-DOS 0.75 (1981-04-18) to 1.00 (1981-07-21)
  7. ^ a b c d "Standard Floppy Disk Formats Supported by MS-DOS". 2.0. Microsoft Help and Support. 2003-05-12. Retrieved 2012-09-11. 
  8. ^ a b c d Ray Duncan (1988). The MS-DOS Encyclopedia - version 1.0 through 3.2. Microsoft Press. ISBN 1-55615-049-0.
  9. ^ a b c d Xerox (1983-11). Xerox 16/8 Professional Computer - MS-DOS OS Handbook for 8" Floppy Disks. 1983-11, MS-DOS 2.0 ([1])
  10. ^ a b As stated at http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q184006& Microsoft's KB article 184006, the limit of 124.55 GB for FAT32 partition size is a mainly a limit of Windows 95/98's 16-bit SCANDISK utility. Other DOS versions supporting FAT32 may allow a larger partition size closer to the theoretical 2 TB/16 TB maximum suggested by FAT32's specifications. Windows 2000 and XP can mount and use a FAT32 partition larger than 32 GB, but they cannot natively create one, which according to Microsoft is by design.
  11. ^ DOS Plus 2.1e/g versions for the Apricot ACT series and for the T.R.A.N. Yasmin Turbo support a non-standard single-sided 315 KB FAT12 format.
  12. ^ DOS Plus DISK.CMD versions for the Amstrad PC1512 and T.R.A.N. Yasmin Turbo and the BBC Master 512 support variants of 720 KB FAT12 formats including the original MS-DOS/PC DOS format, however known versions of DOS Plus itself don't make use of them.
  13. ^ DOS Plus for the BBC Master 512 supports two non-standard FAT12 formats with 640 KB and 800 KB.
  14. ^ a b c d e f g h i j k l The DR DOS 3.41-8.0 BIOS (DRBIOS.SYS aka IBMBIO.COM) has a profile for an undocumented 243 KB logical format with a non-standard media descriptor of E5h. DR DOS 3.31 does not support this format.

External links[edit]