Editing 86-DOS (section)

{{Short description|Computer operating system}}
{{Use dmy dates|date=May 2019|cs1-dates=y}}
{{Use list-defined references|date=December 2021}}
{{Infobox OS
| name = 86-DOS
| logo = 86-DOS logo.svg
| screenshot = 86-DOS running assembler and HEX2BIN (screenshot).png
| caption = A sample 86-DOS session (simulated)
| developer = [[Seattle Computer Products]]&nbsp;/ [[Tim Paterson]]
| supported_platforms = [[x86]]
| kernel_type = [[Monolithic kernel]]
| influenced_by = [[CP/M]]
| ui = [[Command-line interface]] ([[COMMAND.COM]])
| family = [[DOS]]
| released = {{Start date and age|1980|df=yes}}
| latest_release_version = 86-DOS 1.10
| latest_release_date = {{Start date and age|1981|07|df=yes}}
| marketing_target = [[S-100 bus|S-100]]-based micro-computers with 8086 processor
| programmed_in = [[Intel 8086|8086]] [[assembly language]]
| prog_language = [[Intel 8086|8086]] [[assembly language]]
| language = [[English language|English]]
| updatemodel = 
| package_manager = N/A
| working_state = Historic, unsupported
| license = [[Proprietary software|Proprietary]]
| succeeded by = [[MS-DOS]], [[IBM PC DOS]]
| website = 
}}

'''86-DOS''' (known internally as '''QDOS''',<ref name="Paterson_2019_Presentation">{{cite web |last1=Paterson |first1=Tim |title=The Original DOS and the Old Days |url=https://www.youtube.com/watch?v=R2Qh0O3Dt10 |website=YouTube |publisher=Vintage Computer Federation |access-date=1 March 2022 |location=Mountain View, CA, United States |date=5 August 2018}}</ref> for '''Quick and Dirty Operating System''') is a discontinued [[operating system]] developed and marketed by [[Seattle Computer Products]] (SCP) for its [[Intel 8086]]-based computer kit.

86-DOS shared a few of its commands with other operating systems such as [[OS/8]] and [[CP/M]], which made it easy to [[porting|port]] programs from the latter. Its [[application programming interface]] was very similar to that of CP/M. The system was licensed and then purchased by [[Microsoft]] and developed further as [[MS-DOS]] and [[PC&nbsp;DOS]].<ref name="Beley_1986_MS-DOS_Encyclopedia"/>