Editing OS-9 (section)

{{Short description|Real-time operating system}}
{{About||the Macintosh operating system|Mac OS 9|the gene|OS9 (gene)}}
{{more citations needed|date=September 2021}}
{{Use mdy dates|date=February 2023|cs1-dates=y}}
{{Infobox OS
| name = OS-9
| logo = 
| screenshot = 
| caption = [[RadiSys Corporation]]
| developer = {{ubl|Microware LP (2013–present)|[[Radisys]] (2001–2013)|[[Microware]] (1979–2001)}}
| source_model = [[Closed source]]
| kernel_type = [[Real-time computing|Real-time kernel]]
| supported_platforms = [[Motorola 6809]], [[Motorola 68000|Motorola 680x0]] CPUs, [[Freescale ColdFire|ColdFire]], [[SuperH]], [[ARM architecture|ARM/XScale]], [[MIPS architecture|MIPS]], [[PowerPC]], [[Intel]] [[x86 architecture]]
| ui = [[Command line interface|CLI]] in all versions, some platforms support a [[Graphical user interface|GUI]]
| released = {{Start date and age|1979}}
| latest_release_version = 6.1
| latest_release_date = {{Start date and age|2017|11|14}}
| marketing_target = high-performance, high-availability real-time software solution for advanced industrial automation & control, medical instrumentation, aerospace and transportation systems
| programmed_in = [[C (programming language)|C]], [[Assembly language]]
| prog_language = [[C (programming language)|C]], [[Pascal (programming language)|Pascal]], [[COBOL]], [[BASIC]], a [[Forth (programming language)|Forth]] variant, a Unix emulating shell, etc.
| language = [[English language|English]]
| updatemodel = 
| working_state = Current
| license = [[Proprietary software|Proprietary]]
| website = {{URL|https://www.microware.com}}
}}
'''OS-9''' is a family of [[real-time computing|real-time]], [[process (computing)|process-based]], [[computer multitasking|multitasking]], [[multi-user]] [[operating system]]s, developed in the 1980s, originally by [[Microware|Microware Systems Corporation]] for the [[Motorola 6809]] [[microprocessor]]. It was purchased by Radisys Corp in 2001, and was purchased again in 2013 by its current owner [[Microware LP]].

The OS-9 family was popular for general-purpose computing and remains in use in commercial [[embedded system]]s and amongst hobbyists. Today, OS-9 is a product name used by both a [[Motorola 68000]]-series [[machine language]] OS and a portable ([[PowerPC]], [[x86]], [[ARM architecture|ARM]], [[MIPS architecture|MIPS]], [[SuperH|SH4]], etc.) version written in [[C (programming language)|C]], originally known as '''OS-9000'''.