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QEMU is free software written by Fabrice Bellard that implements a fast
processor [[emulator|emulation]], allowing a user to run one operating system
within another one. It is similar to projects such as [[Bochs]] and VMware
Workstation, but has several features these lack, including increased speed and
support for multiple architectures. By using dynamic translation it achieves a
reasonable speed while being easy to port on new host CPUs.
QEMU has two operating modes:
* User mode emulation: QEMU can launch Linux processes compiled for one CPU
on another CPU. Linux system calls are converted because of endianness and
32/64 bit mismatches. Wine and Dosemu are the main targets for QEMU.
* System mode emulation: QEMU emulates a full system, including a processor
and various peripherials. It enables easier testing and debugging of
system code. It can also be used to provide virtual hosting of several
virtual PCs on a single server.
The majority of the program is under the [[LGPL]], with the system mode
emulation under the [[GPL]].
# External Links
* <http://kidsquid.com/cgi-bin/moin.cgi> QEMU Wiki
* [Qemu on Windows](http://www.h7.dion.ne.jp/~qemu-win/)