Editing DR-DOS (section)

{{short description|MSDOS-like operating system}}
{{other uses|DRDOS (disambiguation){{!}}DRDOS}}
{{use list-defined references|date=December 2021}}
{{use American English|date=May 2025}}
{{Use mdy dates|date=May 2025|cs1-dates=y}}
{{cs1 config|mode=cs1|name-list-style=none|display-authors=all}}
{{infobox OS
| name = DR-DOS
| logo = DR DOS wordmark.jpg
| logo size = 100px
| screenshot = DeviceLogics DR-DOS 8.0 720x400.png
| caption = DeviceLogics DR-DOS 8.0
| released = {{Start date and age|1988|05|28}}
| developer = {{unbulleted list|[[Digital Research]]|[[Novell]]|[[Caldera (company)|Caldera]]|[[DeviceLogics]]<ref name="about"/>}}
| family = [[DOS]]
| working state = Discontinued
| source model = Mixed; primarily [[closed-source]], some versions [[open-source software|open-source]]
| discontinued = yes
| latest release version = 7.01.08
| latest release date = {{Start date and age|2011|07|21}}
| latest preview version = 
| latest preview date = 
| marketing target = 
| programmed in = 
| prog_language = 
| language = [[English language|English]], older versions also in German, French, Italian, Spanish, Japanese
| update model = 
| package manager = 
| supported platforms = [[x86]]
| kernel type = [[Monolithic kernel]]
| userland = 
| ui = [[Command-line interface]] ([[COMMAND.COM]])
| license = [[Proprietary software|Proprietary]]
| preceded by = 
| succeeded by = 
| website = {{URL|drdos.com}} (dead since 2018)
}}

'''DR-DOS'''{{refn|group="nb"|written as '''DR&nbsp;DOS''', without a hyphen, in versions up to and including 6.0}} is a [[disk operating system]] for [[IBM PC compatible]]s, originally developed by [[Gary A. Kildall]]'s [[Digital Research|Digital Research, Inc.]] and derived from [[Concurrent PC DOS]] 6.0, which was an advanced successor of [[CP/M-86]]. Upon its introduction in 1988, it was the first DOS that attempted to be [[Binary compatibility|compatible]] with [[IBM PC DOS]] and [[MS-DOS]].

Its first release was version 3.31, named so that it would match MS-DOS's then-current version.<ref>{{Cite web |title=DR DOS 3.x |url=https://winworldpc.com/product/dr-dos/3x |access-date=December 4, 2024 |website=WinWorld |language=en}}</ref> DR DOS 5.0 was released in 1990 as the first to be sold in [[retail]]; it was critically acclaimed<ref>{{Cite web |date=August 14, 2015 |title=Antitrust Division {{!}} Competitive Processes, Anticompetitive Practices And Consumer Harm In The Software Industry: An Analysis Of The Inadequacies Of The Microsoft-Department Of Justice Proposed Final Judgment |url=https://www.justice.gov/atr/competitive-processes-anticompetitive-practices-and-consumer-harm-software-industry-analysis |access-date=December 4, 2024 |website=www.justice.gov |language=en}}</ref> and led to DR DOS becoming the main rival to [[Microsoft]]'s MS-DOS,<ref>{{cite web | url=https://www.nytimes.com/1992/03/29/business/preaching-love-thy-competitor.html | title=Preaching Love Thy Competitor | work=The New York Times | date=March 29, 1992 | last1=Fisher | first1=Lawrence M. }}</ref> who quickly responded with its own MS-DOS 5.0 but releasing over a year later.<ref>{{cite web | url=https://www.nytimes.com/1991/03/13/business/microsoft-in-inquiry-by-ftc.html | title=Microsoft in Inquiry by F.T.C. | work=The New York Times | date=March 13, 1991 | last1=Fisher | first1=Lawrence M. }}</ref> It introduced a [[graphical user interface]] layer called [[ViewMAX]]. DR DOS 6.0 was released in 1991; then with [[Novell]]'s acquisition of Digital Research, the following version was named '''Novell DOS''' 7.0 in 1994. After another sale, to [[Caldera (company)|Caldera]], updated versions were released partly [[open-source]] under the Caldera moniker, and briefly as '''OpenDOS'''. The last version for [[Desktop computer|desktops]], Caldera DR-DOS 7.03, was released in 1999,<ref>{{Cite web |title=Caldera DR-DOS Notes - zxnet |url=https://www.zx.net.nz/netware/drdos/caldera.shtml |access-date=December 4, 2024 |website=www.zx.net.nz}}</ref> after which the software was sold to [[embedded systems]] by Caldera and then by [[DeviceLogics]].