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KolibriOS is an open source operating system with a monolithic preemptive kernel, video drivers, for 32-bit x86 architecture computers, developed and maintained by The KolibriOS Project Team. KolibriOS is a fork of MenuetOS, written entirely in FASM (assembly language). However, C, C++, Free Pascal, Forth, among other high-level languages and compilers, can also be used in user application development.
English, Russian and German versions are available.

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KolibriOS Features

Boots from several devices, NTFS is also supported. You can even start it from Windows (Windows will shutdown).
Graphical user interface based on VESA.
Development kit: code editor with a macro-assembler (FASM) integrated.
Fits on a single 1.44MB Floppy (many applications are compressed).
Runs with 8MB of RAM.
Pre-emptive multitasking, streams, parallel execution of system calls.
Supported file systems are FAT12, FAT16, FAT32 (long names support), NTFS (partially, read only), ext2/ext3 (partially, read only) and CDFS.
AC'97 audio codec support for Intel, nForce, nForce2, nForce3, nForce4, SIS7012, FM801, VT8233, VT8233C, VT8235, VT8237, VT8237R, VT8237R Plus and EMU10K1X chipsets.