x86 operating system
is an operating system for x86 PCs, written in assembly language. It is
a learning tool to show how simple 16-bit, real-mode OSes work, with
well-commented code and extensive documentation. Features:
- A text-mode dialog and menu-driven interface
- Boots from a floppy disk, CD-ROM or USB key
- Over 60 system calls for use by third-party programs
- File manager, text editor, image viewer, games...
- Includes a BASIC interpreter with 46 instructions
- PC speaker sound and serial terminal connection
The code is completely open source (under a BSD-like license), and is written by Mike Saunders and other developers.
- 21 Dec 2014: MikeOS 4.5 released -- Lots of new features, including a Forth interpreter. See the changelog for all the details.
- 10 Jun 2014: Moved to SourceForge -- BerliOS has closed down, so MikeOS has moved to SourceForge. Please update your links!
- 28 Oct 2013: MikeOS mouse library released -- Joshua Beck has implemented his TachyonOS mouse code as a MikeOS library. See the Downloads section below.
- 23 Mar 2013: MikeOS 4.4 released -- Sudoku, Cosmic Flight, new BASIC features and much more.
- 1 Mar 2013: New TachyonOS project -- A very cool MikeOS spin-off with lots of experimental new features. Click here for the website.
The link below contains the source code (see the source and programs directories), along with disk images for floppies/USB keys and CD-Rs in the disk_images folder.
You can write the images to a floppy disk, USB key or CD-R and boot
your PC from them to test -- or use a PC emulator such as QEMU,
VirtualBox or VMware. See the User Handbook below for a guide. System
requirements: minimum 386 PC with a keyboard and 1MB of RAM.
Here are some contributed add-on programs:
And projects that use MikeOS:
MikeOS downloads (since version 1.0) as of 21 Dec 2014: 65,812
Click on the thumbnails below to see full-size versions.
These four Handbooks provide the complete documentation for MikeOS:
Note that the Handbooks are also included with MikeOS, in the doc directory. If you're new to the world of OS development, see our guide: write a simple assembly language operating system from scratch (Serbo-Croat translation).
To discuss MikeOS and similar 16-bit real mode operating systems, join us on Google Groups.
- E Dehling
- Ian Seyler
- Joshua Beck
- Justin Tokarchuk
- Matej Horvat
- Michael van Tellingen
- Mike Gonta
- Peter Nemeth
- Paulo Valongo
- Takayoshi Sasano
- Tomasz Gorol
- Tslil Clingman
- Walt Nagel
- Yutaka Saiko
Website, docs and artwork
- Nitin Reddy Katkam -- logo and site design
- Paul Sommers -- Handbook API reference
- Helen Ewart -- MikeOS cat mascot
Some website artwork from the Tango icon set.
Projects based on or inspired by MikeOS: