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Bochs
What it is
Bochs is a free, open-source emulator that models IA-32 x86 PC hardware. It can simulate Intel CPU families from 386 through x86-64, along with common I/O devices and a custom BIOS, allowing users to run guest systems such as Linux, DOS, and Windows. Optional command-line and graphical debuggers provide register and memory inspection and breakpoint setting. Graphics support includes VGA, VESA VBE up to 2560x1600x32bpp, Cirrus Logic video, and four 3dfx Voodoo adapter models. Bochs also simulates USB controllers and devices; on several host systems, it can forward guest network packets to a physical network. Multiprocessor simulation can be configured for up to 254 processor threads, but is experimental. The emulator uses a single-threaded simulation core and does not use dynamic code translation or virtualization. It provides virtual hardware rather than an installation wizard or guest operating system media, so users handle guest installation. Some features, including the debugger, may require compiling Bochs from source.
For and against
For
- Supports guest systems including Linux, DOS, and Windows
- Optional command-line and graphical debuggers
- Simulates a range of graphics and USB hardware
- Free and open source
Against
- No setup wizard or guest installation media
- Some features may require compiling from source
- Multiprocessor simulation is experimental
- Uses a single-threaded simulation core
The verdict
Bochs offers a wide range of simulated x86 hardware and optional debugging tools. Users need to install guest systems themselves, and its simulation approach is single-threaded.
Who it suits
Bochs is suited to users who need to emulate x86 hardware for running guest operating systems or examining system behavior with its optional debuggers.
Plans and prices
Bochs
No setup wizard · guest OS installation is user's responsibility · some features require compiling from source
Read 1 Oct 2026 · bochs.sourceforge.io
On the record
- Clipboard
- Depending on the host platform, text can be copied between the text-mode screen and the guest OS clipboard through simulated keystrokes.bochs.sourceforge.io · read 1 Oct 2026
- CPU range
- It can emulate Intel CPU families from 386 through recent x86-64 Intel and AMD processors.bochs.sourceforge.io · read 1 Oct 2026
- Debugger
- It provides optional command-line and GUI debuggers for examining registers and memory and setting breakpoints.bochs.sourceforge.io · read 1 Oct 2026
- Emulated systems
- It includes Intel x86 CPU, common I/O-device, and custom-BIOS emulation.bochs.sourceforge.io · read 1 Oct 2026
- Graphics
- The emulator supports VGA, VESA VBE resolutions up to 2560x1600x32bpp, Cirrus Logic video, and four 3dfx Voodoo adapter models.bochs.sourceforge.io · read 1 Oct 2026
- Guest operating systems
- Bochs can run most operating systems inside the emulation, including Linux, DOS, and Microsoft Windows.bochs.sourceforge.io · read 1 Oct 2026
- Installation
- Users can install a binary package or compile from source, and some features such as the debugger may require compiling Bochs themselves.bochs.sourceforge.io · read 1 Oct 2026
- License
- The Bochs Project distributes Bochs under the GNU Lesser General Public License.bochs.sourceforge.io · read 1 Oct 2026
- Multiprocessor emulation
- It can be configured to simulate up to 254 processor threads, although this feature is described as experimental.bochs.sourceforge.io · read 1 Oct 2026
- Networking
- It emulates NE2000 or Intel 82540EM network adapters and can forward guest packets to the physical network on several host systems.bochs.sourceforge.io · read 1 Oct 2026
- Performance model
- Bochs does not attempt dynamic code translation or virtualization and uses a single-threaded simulation core.bochs.sourceforge.io · read 1 Oct 2026
- Setup requirements
- There is no setup wizard or recovery or installation disk; Bochs supplies virtual hardware and users handle guest OS installation.bochs.sourceforge.io · read 1 Oct 2026
- Support
- The project directs unresolved runtime issues to its developers mailing list or SourceForge bug tracker.bochs.sourceforge.io · read 1 Oct 2026
- USB
- Bochs supports UHCI, OHCI, EHCI, and xHCI controllers plus emulated mouse, tablet, keyboard, disk, CD-ROM, floppy, hub, and printer devices.bochs.sourceforge.io · read 1 Oct 2026
- What it does
- Bochs is a highly portable open-source IA-32 (x86) PC emulator written in C++.bochs.sourceforge.io · read 1 Oct 2026
