# OpenMSX

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/OpenMSX
> Markdown URL: https://mediated.wiki/source/OpenMSX.md
> Source: https://en.wikipedia.org/wiki/OpenMSX
> Source revision: 1353620507
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Infobox software
| name = openMSX
| logo = OpenMSX-logo-256.png
| caption = 
| developer = openMSX [Team](/source/Virtual_team)
| released = {{release date and age|2002|03|25}}<ref>{{cite web |url=https://sourceforge.net/projects/openmsx/files/openmsx/0.1.5/ |title=openMSX - Browse /openmsx/0.1.5 at SourceForge.net}}</ref>
| latest release version = 21.0
| latest release date = {{release date and age|2025|09|26}}<ref>{{cite web|url=https://openmsx.org/|title=Home|accessdate=27 September 2025}}</ref>
| latest preview version = 
| latest preview date = 
| programming language = [C++](/source/C%2B%2B) (core), [Tcl](/source/Tcl_(programming_language)), (openmsx-catapult: [wxWidgets](/source/wxWidgets))<ref>{{cite web | url=https://packages.debian.org/jessie/openmsx-catapult | title=Debian -- Details of package openmsx-catapult in jessie | accessdate=2017-03-10}}</ref>
| operating system = [POSIX](/source/POSIX) and [Windows](/source/Microsoft_Windows)
| platform = 
| genre = [Emulator](/source/Emulator)
| license = [GNU GPLv2](/source/GNU_General_Public_License)
| website = {{URL|//openmsx.org}}
}}
{{Lowercase title}}
thumb|right|openMSX running CBIOS

'''openMSX''' is a [free software](/source/free_software) [emulator](/source/emulator) for the [MSX architecture](/source/MSX). It is available for multiple platforms, including [Microsoft Windows](/source/Microsoft_Windows) and [POSIX](/source/POSIX) systems such as [Linux](/source/Linux). 

For copyright reasons, the emulator cannot be distributed with original MSX-BIOS [ROM images](/source/ROM_image). Instead, openMSX includes C-BIOS, a minimal implementation of the MSX BIOS, allowing some games to be played without the original ROM image. It is possible for the user to replace C-BIOS by native BIOS if they prefer.

openMSX emulates a large amount of MSX systems and MSX-related hardware, including:

*MSX TurboR
*[Moonsound](/source/Moonsound)
*[IDE](/source/AT_Attachment) Controller by Sunrise
*GFX9000
*Pioneer Palcom LaserDisc

openMSX also emulates the [SV-318](/source/SV-318)/[SV-328](/source/SV-328) computers, the [ColecoVision](/source/ColecoVision) and the [Sega SG-1000](/source/SG-1000).

Notable features include:
*Scalers
*Debugging including visual debugging of graphics
*[Tcl](/source/Tcl_(programming_language)) Script Support
*Cheat Finder
*Game Trainers
*Audio/Video recording
*Reverse support (go back in emulated time to correct mistakes or debug what happened)

openMSX has an open communication protocol to communicate with the openMSX emulator. Utilizing this communication protocol enables to write versatile add-ons for openMSX. Projects making use of this protocol include the following applications:
*openMSX Catapult (by the openMSX team; obsoleted by the new graphical user interface introduced with openMSX 20.0)
*openMSX Debugger (by the openMSX team; obsoleted by the built-in debugger introduced with openMSX 20.0))
*openMSXControl plugin
*NekoLauncher openMSX
*openMSX Peashooter
*openMSX Control Plugin for Gedit

There is a dead subproject to redevelop Catapult, a [GUI](/source/GUI) developed for the emulator that is part of the project, utilizing [Python](/source/Python_(programming_language)) and the [Qt](/source/Qt_(toolkit)) toolkit.

The separate openMSX Debugger, written in [C++](/source/C%2B%2B) and utilizing the [Qt Toolkit](/source/Qt_(toolkit)) is not in development anymore, as efforts are now focused on the built-in debugger.

As of release 20.0, a GUI was integrated that replaces almost all functionality of the Catapult and separate Debugger programs. Both these sub-projects will not be developed further, in favour of the built-in functionality. The new GUI uses the ''Dear ImGUI'' toolkit.

==References==
{{Reflist}}

==Sources==
{{Portal|Free and open-source software}}
*[https://github.com/openMSX/ Project Homepage]
*[http://www.msx.org/forum/semi-msx-talk/openmsx Project Forum]
*[https://web.archive.org/web/20101020022102/http://www.vampier.net/cbios/ C-BIOS Compatibility Page]
*[http://www.msx.org/openMSX-0.5.1.MSX-Emulator-Comparison.articlepage16.html openMSX 0.5.1 review (2005)] {{Webarchive|url=https://web.archive.org/web/20100628075119/http://www.msx.org/openMSX-0.5.1.MSX-Emulator-Comparison.articlepage16.html |date=2010-06-28 }}
*[http://nekocanmac.seesaa.net/ NekoLauncher openMSX]
*[http://www.macupdate.com/info.php/id/26767/openmsx-peashooter openMSX Peashooter ] {{Webarchive|url=https://web.archive.org/web/20091213051116/http://www.macupdate.com/info.php/id/26767/openmsx-peashooter |date=2009-12-13 }}
*[http://msx.jannone.org/openMSXcontrol/ openMSX Control Plugin for Gedit]
*[http://openmsx.fixato.net openMSX development builds for Mac, Windows, Android & Dingux]

{{DEFAULTSORT:Openmsx}}
Category:Free emulation software
Category:Free software programmed in Tcl
Category:Free software projects
Category:Linux emulation software
Category:MSX emulators
Category:Software that uses wxWidgets
Category:Unix emulation software
Category:macOS emulation software
Category:Windows emulation software
Category:Android emulation software
Category:Free and open-source Android software

---
Adapted from the Wikipedia article [OpenMSX](https://en.wikipedia.org/wiki/OpenMSX) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/OpenMSX?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.