86Box vs Bochs

86Box is a free emulator for x86-based IBM PC systems and compatibles, covering machines from 1981 through PCI-bus systems. It emulates processors from the 8086 through the Pentium with an emphasis on accuracy and supports configurable machines such as the IBM PC 5150 and IBM PS/2 line. Users can select video adapters, sound cards, network adapters, hard-disk controllers, and SCSI adapters. Supported guest systems include MS-DOS, older Windows releases, OS/2, many Linux distributions, BeOS, and NEXTSTEP. MIDI output can use Windows MIDI support, FluidSynth, or emulated Roland synthesizers. 86Box runs on Windows, Linux, and macOS and is released under the GNU General Public License version 2 or later. The project offers stable and experimental builds; experimental versions may be less stable or slower. Most emulation logic runs in one thread, so results depend on host and guest configuration. A BIOS is required. The project recommends manager applications for multiple virtual machines, while its built-in manager is still a preview.

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, common I/O devices, and a custom BIOS, allowing users to run guest systems such as Linux, DOS, Windows, BSD, and other x86 operating systems. Optional command-line and graphical debuggers provide ways to inspect registers and memory or set breakpoints. Graphics support includes VGA, VESA VBE resolutions up to 2560x1600x32bpp, Cirrus Logic video, and four 3dfx Voodoo adapter models. Bochs also emulates USB controllers and devices, and can forward guest network packets to a physical network on several host systems. 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 supplies virtual hardware, not a setup wizard or guest installation disk, so users install guest systems themselves. Binary packages and source compilation are options; some features may require compiling it. It is available for Windows, Linux, and macOS, among other documented host systems.