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Comparison of DOS operating systems

{{short description|None}}

{{Use dmy dates|date=May 2019|cs1-dates=y}}

This article details versions of MS-DOS, IBM PC DOS, and at least partially compatible disk operating systems. It does not include the many other operating systems called "DOS" which are unrelated to IBM PC compatibles.

Historical and licensing information

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 fully IBM PC compatible.

class="sortable wikitable" style="font-size: 85%; text-align: center; width: auto;"
style="width: 12em" | Name

! First public release date

! style="width: 11em" | Creator

! Owner or maintainer {{As of|2021|lc=y}}

! License

{{rh}} | 86-DOS 0.42

| 1981-02-25

| rowspan="2" | Seattle Computer Products

| rowspan="15" {{no|Support ended}}

| rowspan="16" {{Proprietary}}

{{rh}} | 86-DOS 1.00

| 1981-04-28

{{rh}} | PC DOS 1.0

| 1981-08-12

| rowspan="14" | Microsoft (for IBM)

{{rh}} | PC DOS 1.1

| 1982-05-??

{{rh}} | PC DOS 2.0

| 1983-03-??

{{rh}} | PC DOS 2.1

| 1983-10-??

{{rh}} | PC DOS 3.0

| 1984-08-??

{{rh}} | PC DOS 3.1

| 1985

{{rh}} | PC DOS 3.2

| 1986

{{rh}} | PC DOS 3.3

| 1987

{{rh}} | IBM DOS 4.0
(called PC DOS 4.0)

| 1988

{{rh}} | IBM DOS 5.0
(called PC DOS 5.0)

| 1991

{{rh}} | PC DOS 6.1, PC DOS 6.3

| 1993

{{rh}} | PC DOS 7.0 (revision 0)

| 1995

{{rh}} | PC DOS 2000
(PC DOS 7.0 revision 1)

| 1998

{{rh}} | PC DOS 7.10

| 2003

| {{no|Support ended by IBM}}

{{rh}} | MS-DOS 1.25{{cite web |title=Father of DOS Still Having Fun at Microsoft |last=Conner |first=Doug |publisher=Micronews |url=http://www.patersontech.com/Dos/Micronews/paterson04_10_98.htm |url-status=dead |archive-url=https://web.archive.org/web/20100209023553/http://www.patersontech.com/Dos/Micronews/paterson04_10_98.htm |archive-date=9 February 2010 |df=dmy-all }} (first version named "MS-DOS")

| 1982

| Microsoft

| rowspan="16" {{no|Support ended}}

| {{open source}}, MIT License{{cite web|url=https://cloudblogs.microsoft.com/opensource/2024/04/25/open-sourcing-ms-dos-4-0/|title=Open sourcing MS-DOS 4.0|date=2024-04-25|publisher=Microsoft Open Source Blog}}

{{rh}} | Z-DOS 1.25

| 1982-05-??

| OEM Zenith Data Systems

| {{Proprietary}}

{{rh}} | MS-DOS 2.0

| 1983-03-??

| rowspan="15" | Microsoft

| {{open source}}, MIT License

{{rh}} | MS-DOS 2.11

| 1983-12-??

| rowspan="5" {{Proprietary}}

{{rh}} | MS-DOS 3.0

| rowspan="2" | 1984

{{rh}} | MS-DOS 3.1
{{rh}} | MS-DOS 3.2

| 1986

{{rh}} | MS-DOS 3.3

| 1987

{{rh}} | MS-DOS 4.0

| 1988

| {{open source}}, MIT License

{{rh}} | MS-DOS 5.0

| 1991

| rowspan="15" {{Proprietary}}

{{rh}} | MS-DOS 6.0

| rowspan="2" | 1993

{{rh}} | MS-DOS 6.20
{{rh}} | MS-DOS 6.21

| March 1994

{{rh}} | MS-DOS 6.22

| April 1994

{{rh}} | MS-DOS 7.0 (Windows 95A)

| 1995

{{rh}} | MS-DOS 7.10 (Windows {{nowrap|95 OSRs 2 and 2.5}}, 98, {{nowrap|98 SE}})

| 1996

{{rh}} | MS-DOS 8.0 (Windows Me and later)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 {{mono|00006510h}} byte {{mono|75h}} by byte {{mono|EBh}}, or substituted by (now freeware) 4DOS http://www.jpsoft.com/download.htm {{Webarchive|url=https://web.archive.org/web/20060901044959/http://www.jpsoft.com/download.htm |date=2006-09-01 }}

| 2000

| {{No|Support ended by Microsoft}}While Windows ME support ended, a version of its underlying DOS is included with {{nowrap|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".

{{rh}} | DOS Plus 1.1, 1.2/1.2a

| 1985

| rowspan="6" | Digital Research

| rowspan="7" {{no|Support ended}}

{{rh}} | DOS Plus 2.1

| 1986

{{rh}} | DR DOS 3.31-3.35

| 1988

{{rh}} | DR DOS 3.40-3.41

| 1989

{{rh}} | DR DOS 5.0

| 1990

{{rh}} | DR DOS 6.0

| 1991

{{rh}} | Novell DOS 7

| 1993

| Novell

{{rh}} | Caldera OpenDOS 7.01

| rowspan="2" | 1997

| rowspan="3" | Caldera, Inc.;
Caldera UK, Ltd.

| {{no|Support ended}} officially;
a derivative, Enhanced DR-DOS, was
maintained by Udo Kuhnt until 2011

| rowspan="2" {{Partial}}, free non-commercial use

{{rh}} | Caldera DR-OpenDOS 7.02

| rowspan="2" {{no|Support ended}}

{{rh}} | Caldera DR-DOS 7.02

| 1998

| rowspan="4" {{Proprietary}}

{{rh}} | Caldera DR-DOS 7.03

| 1999, 1998 prereleased

| Caldera Thin Clients, Inc.;
Caldera UK, Ltd;
Lineo, Inc.

| {{no|DRDOS, Inc.}}

{{rh}} | DR-DOS 8.0

| 2004

| DeviceLogics

| rowspan="2" {{no|Support ended}}

{{rh}} | DR-DOS 8.1DR-DOS 8.1 was pulled from the market after it was discovered that 8.1 code had been copied from FreeDOS in violation of the GPL license.

| 2005

| DRDOS, Inc.

{{rh}} | FreeDOS 1.0

| 2006-09-03

| rowspan="4" | Jim Hall, et al.

| rowspan="4" {{yes|The FreeDOS Project}}

| rowspan="4" {{open source}}, GPL

{{rh}} | FreeDOS 1.1

| 2012-01-02

{{rh}} | FreeDOS 1.2

| 2016-12-25

{{rh}} | FreeDOS 1.3

| 2021-12-14

{{rh}} | PTS-DOS 6.4

| 1993

| rowspan="5" | PhysTechSoft{{cite web |url=http://phystechsoft.ru/pts-dos |title=Phystechsoft |quote=PTS-DOS 32 [..] Memory Manager himem.sys, included in PTS-DOS 32, supports up to 4 GB of RAM.
PTS-DOS 2000 [..] PTS-DOS is a powerful and fast 16-bit disk operating system, fully compatible with MS-DOS and all its applications. |access-date=2016-09-19}}

| rowspan="5" {{no|PhysTechSoft}}

| rowspan="11" {{Proprietary}}

{{rh}} | PTS-DOS 6.5

| rowspan="4" | ?

{{rh}} | PTS-DOS 6.6
{{rh}} | PTS-DOS 2000 (6.7)
{{rh}} | PTS-DOS 32 (7.0)
{{rh}} | PTS-DOS 6.51

| ca. 1995

| rowspan="2" | Paragon Technology Systems

| rowspan="2" {{no|Paragon Technology Systems}}

{{rh}} | Paragon DOS 2000 Pro

| rowspan="4" | ?

{{rh}} | ROM-DOS 6.22{{cite web |url=https://www.datalight.com/products/rom-dos/rom-dos-single-user-version |title=ROM-DOS Single User Version |quote=6.22 and 7.1 kernels |access-date=2016-09-19}}

| rowspan="2" | Datalight

| rowspan="2" {{yes|Datalight}}

{{rh}} | ROM-DOS 7.1
{{rh}} | Embedded DOS

| General Software

| {{no|General Software}}

{{rh}} | DIP DOS 2.11

| 1989

| DIP Research, Atari Corporation

| {{no|Support ended}}

{{rh}} | RxDOS 6.2

| 1999

| Michael Podanoffsky

| {{no|Support ended}}

| rowspan="2" {{open source}}, GPL

{{rh}} | RxDOS 7.20-7.24

| 2018

| C. Masloch

| {{yes|C. Masloch}}

{{rh}} | SISNE plus

| ?

| Itautec, Scopus Tecnologia

| {{no|Support ended}}

| {{Proprietary}}

Technical specifications

class="sortable wikitable" style="font-size: 85%; text-align: center; width: auto;"
{{rh}} | Name

! Hard drive: partition size max

! Native support:
File systems

! Native support:
floppy capacities 3.5"

! style="width: 12em" | Native support:
floppy capacities 5.25"

! style="width: 12em" | Native support:
floppy capacities 8.0"

! Integrated disk compression utility

! Native support:
long file names

{{rh}} | 86-DOS 0.42-1.00

| {{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 KBhttp://www.86dos.org/downloads/86DOS_FILES.ZIP {{Webarchive|url=https://web.archive.org/web/20110724210024/http://www.86dos.org/downloads/86DOS_FILES.ZIP |date=24 July 2011 }}, A ZIP file containing most of the files from 86-DOS 0.75 (1981-04-18) to 1.00 (1981-07-21)

| {{No}}

| {{No}}

{{rh}} | MS-DOS 1.25

| {{n/a}}

| FAT12

| {{n/a}}

| 160 KB; 320 KB

| 250.25 KB{{cite web | url = http://support.microsoft.com/kb/75131 | title = Standard Floppy Disk Formats Supported by MS-DOS | publisher = Microsoft Help and Support | date = 2003-05-12 | access-date = 2012-09-11 | version = 2.0}}

| {{No}}

| {{No}}

{{rh}} | MS-DOS 2.0-2.11

| 16 MB (32 MB with third-party FORMAT)Scott Mueller (1995). Upgrading and Repairing PCs, 5th Edition. Que Corporation. {{ISBN|0-7897-0321-1}}. p784: "The limit of 16MB did not come from the FAT, but from the high-level DOS FORMAT command... Most vendors supplied modified high-level format programs that permitted partitions of up to 32MB to be formatted properly."

| FAT12

| {{n/a}}

| 160 KB; 180 KB; 320 KB; 360 KB

| 250.25 KB; 500.5 KB; 616 KB; 1232 KBXerox (1983-11). Xerox 16/8 Professional Computer - MS-DOS OS Handbook for 8" Floppy Disks. 1983-11, MS-DOS 2.0 ([http://bitsavers.trailing-edge.com/pdf/xerox/820-II/610P72377_MS-DOS_OS_Handbook_for_8_Inch_Floppy_Disks_Nov83.pdf])

| {{No}}

| {{No}}

{{rh}} | 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}}

{{rh}} | 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}}

{{rh}} | 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}}

{{rh}} | 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}}

{{rh}} | MS-DOS 3.31

| 512 MB

| FAT12, FAT16, FAT16B

| 720 KB; 1.44 MB

| 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | 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}}

{{rh}} | 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}}

{{rh}} | 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}}

| {{Yes|DoubleSpace}}

| {{No}}

{{rh}} | 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}}

| {{Yes|DoubleSpace}}

| {{No}}

{{rh}} | 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}}

{{rh}} | 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}}

| {{Yes|DriveSpace}}

| {{No}}

{{rh}} | 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}}

| {{Yes|DriveSpace}}

| {{No}}

{{rh}} | MS-DOS 7.1 (Windows 95B/OSR2, Windows 95C/OSR2.5, Windows 98, and Windows 98SE)

| 124.55 GB with FAT32As 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.

| 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}}

| {{Partial|DriveSpace for Windows 95, none for Windows 98}}

| {{No}}

{{rh}} | MS-DOS 8.0 (Windows Me and later Windows versions)

| 124.55 GB with FAT32

| 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}}

{{rh}} | PC DOS 1.0

| {{n/a}}

| FAT12

| {{n/a}}

| 160 KB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | PC DOS 1.1

| {{n/a}}

| FAT12

| {{n/a}}

| 160 KB; 320 KB (double-sided)

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | PC DOS 2.0-2.1

| 16 MB (32 MB with third-party FORMAT)

| FAT12

| {{n/a}}

| 160 KB; 180 KB; 320 KB; 360 KB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | 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}}

{{rh}} | 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}}

{{rh}} | 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}}

{{rh}} | 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}}

{{rh}} | IBM 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}}

{{rh}} | IBM 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}}

{{rh}} | 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}}

{{rh}} | 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}}

| {{Yes|SuperStor}}

| {{No}}

{{rh}} | 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}}

| {{Yes|Stacker}}

| {{No}}

{{rh}} | PC DOS 7.10

| {{dunno}}

| 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}}

| {{Partial|Stacker, not on FAT32}}

| {{No}}

{{rh}} | DOS Plus 1.1

| 32 MB

| FAT12, FAT16, CP/M-86

| 315 KB; 720 KB; CP/M 315 KB; CP/M 720 KB; MSX-DOS 360 KB; MSX-DOS 720 KB

| 160 KB; 180 KB; 320 KB; 360 KB; 800 KB; 1.2 MB; CP/M 160 KB; CP/M 320 KB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | DOS Plus 1.2-2.1

| 32 MB

| FAT12, FAT16, CP/M-86

| Apricot 315 KB;DOS Plus 2.1e/g versions for the Apricot ACT series and for the Jasmin Turbo from the French company T.R.A.N. S.A. support a non-standard single-sided 315 KB FAT12 format. (720 KBDOS Plus DISK.CMD versions for the Amstrad PC1512, the T.R.A.N. Jasmin Turbo and the BBC Master 512 support variants of 720 KB FAT12 formats including the original MS-DOS, and PC DOS format, however known versions of DOS Plus itself don't make use of them.)

| 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB; Acorn 640 KB; Acorn 800 KB;DOS Plus for the BBC Master 512 supports two non-standard FAT12 formats with 640 KB and 800 KB. CP/M 320 KB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | DR DOS 3.31-3.35

| 2 GB{{citation needed|date=January 2012}}

| FAT12, FAT16, FAT16B

| 720 KB; 1.44 MB

| 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | 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

| (250.25 KBThe DR DOS 3.41-8.0 BIOS (DRBIOS.SYS aka IBMBIO.COM) has a profile for an undocumented 250.25 KB (aka "243 KB") logical format with a non-standard media descriptor of E5h. DR DOS 3.31 does not support this format. The format is similar, but not identical to the two 250.25 KB formats with FAT IDs FDh and FEh supported by MS-DOS 1.25/2.x.)

| {{No}}

| {{No}}

{{rh}} | 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

| (250.25 KB)

| {{No}}

| {{No}}

{{rh}} | 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

| (250.25 KB)

| {{Yes|SuperStor}}

| {{No}}

{{rh}} | PalmDOS 1.0

| 2 GB

| FAT12, FAT16, FAT16B

| 720 KB; 1.44 MB, 2.88 MB

| 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB

| (250.25 KB)

| {{Yes|SuperStor}}

| {{No}}

{{rh}} | 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

| (250.25 KB)

| {{Yes|Stacker}}

| {{No}}

{{rh}} | 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

| (250.25 KB)

| {{Yes|Stacker}}

| {{No}}

{{rh}} | 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

| (250.25 KB)

| {{Yes|Stacker}}

| {{No}}

{{rh}} | 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

| (250.25 KB)

| {{Yes|Stacker}}

| {{Partial}}, COMMAND.COM and LONGNAME only

{{rh}} | 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

| (250.25 KB)

| {{Yes|Stacker}}

| {{Partial}}, COMMAND.COM and LONGNAME only

{{rh}} | DR-DOS 7.04-7.05

| {{dunno}}

| 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

| (250.25 KB)

| {{Partial|Stacker, not on FAT32}}

| {{Partial}}, COMMAND.COM and LONGNAME only

{{rh}} | DR-DOS 7.06-7.07

| {{dunno}}

| FAT12, FAT16, FAT16B, FAT32 (bootable)

| 720 KB; 1.44 MB, 2.88 MB

| 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB

| (250.25 KB)

| {{Partial|Stacker, not on FAT32}}

| {{Partial}}, COMMAND.COM and LONGNAME only

{{rh}} | DR-DOS 8.0

| {{dunno}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 160 KB; 180 KB; 320 KB; 360 KB; 1.2 MB

| (250.25 KB)

| {{Partial|Supported, not on FAT32}}

| {{Partial}}, COMMAND.COM only

{{rh}} | DR-DOS 8.1

| {{dunno}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | FreeDOS 1.0

| 2 TB {{Citation needed|date=January 2012}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 360 KB; 1.2 MB

| {{n/a}}

| {{Dunno}}

| {{No}}

{{rh}} | FreeDOS 1.1-1.3

| 2 TB {{Citation needed|date=January 2012}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{Yes}}

{{rh}} | PTS-DOS 32

| {{dunno}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | PTS-DOS 2000

| {{dunno}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | PTS-DOS 2000 PRO

| {{dunno}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{No}}

{{rh}} | Datalight ROM-DOS

| {{dunno}}

| FAT12, FAT16, FAT16B, FAT32

| 720 KB; 1.44 MB, 2.88 MB

| 360 KB; 1.2 MB

| {{n/a}}

| {{No}}

| {{Yes}}

{{rh}} | DIP DOS

| {{n/a}}

| FAT12

| {{n/a}}

| {{n/a}}

| {{n/a}}

| {{No}}

| {{No}}

See also

References

{{reflist|refs=

{{cite web|title=Microsoft DOS history |publisher=ComputerHope |url=https://www.computerhope.com/history/dos.htm}}

{{cite book |title=The MS-DOS Encyclopedia: versions 1.0 through 3.2 |author-first1=Ray |author-last1=Duncan |author-first2=Steve |author-last2=Bostwick |author-first3=Keith |author-last3=Burgoyne |author-first4=Robert A. |author-last4=Byers |author-first5=Thom |author-last5=Hogan |author-first6=Jim |author-last6=Kyle |author-first7=Gordon |author-last7=Letwin |author-link7=Gordon Letwin |author-first8=Charles |author-last8=Petzold |author-link8=Charles Petzold |author-first9=Chip |author-last9=Rabinowitz |author-first10=Jim |author-last10=Tomlin |author-first11=Richard |author-last11=Wilton |author-first12=Van |author-last12=Wolverton |author-first13=William |author-last13=Wong |author-first14=JoAnne |author-last14=Woodcock |contribution=Technical advisors |contributor-first1=Mark |contributor-last1=Zbikowski |contributor-link1=Mark Zbikowski |contributor-first2=Paul |contributor-last2=Allen |contributor-link2=Paul Allen |contributor-first3=Steve |contributor-last3=Ballmer |contributor-link3=Steve Ballmer |contributor-first4=Reuben |contributor-last4=Borman |contributor-first5=Rob |contributor-last5=Borman |contributor-first6=John |contributor-last6=Butler |contributor-first7=Chuck |contributor-last7=Carroll |contributor-first8=Mark |contributor-last8=Chamberlain |contributor-first9=David |contributor-last9=Chell |contributor-first10=Mike |contributor-last10=Colee |contributor-first11=Mike |contributor-last11=Courtney |contributor-first12=Mike |contributor-last12=Dryfoos |contributor-first13=Rachel |contributor-last13=Duncan |contributor-first14=Kurt |contributor-last14=Eckhardt |contributor-first15=Eric |contributor-last15=Evans |contributor-first16=Rick |contributor-last16=Farmer |contributor-first17=Bill |contributor-last17=Gates |contributor-link17=Bill Gates |contributor-first18=Michael |contributor-last18=Geary |contributor-first19=Bob |contributor-last19=Griffin |contributor-first20=Doug |contributor-last20=Hogarth |contributor-first21=James W. |contributor-last21=Johnson |contributor-first22=Kaamel |contributor-last22=Kermaani |contributor-first23=Adrian |contributor-last23=King |contributor-first24=Reed |contributor-last24=Koch |contributor-first25=James |contributor-last25=Landowski |contributor-first26=Chris |contributor-last26=Larson |contributor-first27=Thomas |contributor-last27=Lennon |contributor-first28=Dan |contributor-last28=Lipkie |contributor-first29=Marc |contributor-last29=McDonald |contributor-link29=Marc McDonald |contributor-first30=Bruce |contributor-last30=McKinney |contributor-first31=Pascal |contributor-last31=Martin |contributor-first32=Estelle |contributor-last32=Mathers |contributor-first33=Bob |contributor-last33=Matthews |contributor-first34=David |contributor-last34=Melin |contributor-first35=Charles |contributor-last35=Mergentime |contributor-first36=Randy |contributor-last36=Nevin |contributor-first37=Dan |contributor-last37=Newell |contributor-first38=Tani |contributor-last38=Newell |contributor-first39=David |contributor-last39=Norris |contributor-first40=Mike |contributor-last40=O'Leary |contributor-first41=Bob |contributor-last41=O'Rear |contributor-link41=Bob O'Rear |contributor-first42=Mike |contributor-last42=Olsson |contributor-first43=Larry |contributor-last43=Osterman |contributor-first44=Ridge |contributor-last44=Ostling |contributor-first45=Sunil |contributor-last45=Pai |contributor-first46=Tim |contributor-last46=Paterson |contributor-link46=Tim Paterson |contributor-first47=Gary |contributor-last47=Perez |contributor-first48=Chris |contributor-last48=Peters |contributor-first49=Charles |contributor-last49=Petzold |contributor-link49=Charles Petzold |contributor-first50=John |contributor-last50=Pollock |contributor-first51=Aaron |contributor-last51=Reynolds |contributor-link51=Aaron R. Reynolds |contributor-first52=Darryl |contributor-last52=Rubin |contributor-first53=Ralph |contributor-last53=Ryan |contributor-first54=Karl |contributor-last54=Schulmeisters |contributor-first55=Rajen |contributor-last55=Shah |contributor-first56=Barry |contributor-last56=Shaw |contributor-first57=Anthony |contributor-last57=Short |contributor-first58=Ben |contributor-last58=Slivka |contributor-first59=Jon |contributor-last59=Smirl |contributor-first60=Betty |contributor-last60=Stillmaker |contributor-first61=John |contributor-last61=Stoddard |contributor-first62=Dennis |contributor-last62=Tillman |contributor-first63=Greg |contributor-last63=Whitten |contributor-first64=Natalie |contributor-last64=Yount |contributor-first65=Steve |contributor-last65=Zeck |date=1988 |edition=Completely reworked |publisher=Microsoft Press |location=Redmond, Washington, USA |isbn=1-55615-049-0 |lccn=87-21452 |oclc=16581341}} (xix+1570 pages; 26 cm) (NB. This edition was published in 1988 after extensive rework of the withdrawn 1986 first edition by a different team of authors. [https://www.pcjs.org/pubs/pc/reference/microsoft/mspl13/msdos/encyclopedia/])

}}

External links

  • [https://web.archive.org/web/20071028074338/http://oldfiles.org.uk/powerload/timeline.htm Detailed timeline of DOS variants]
  • [https://web.archive.org/web/20161125115620/http://www.freedos.org/technotes/press/2000-drdos-hist.txt DR-DOS version dates]

{{Disk operating systems}}

Comparison of DOS

DOS