bochs

Open source x86 PC emulator for running legacy operating systems.

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Open source IA-32 (x86) PC emulator written in C++

bochsbximage

start emulating a dos operating system$ bochs

create a virtual hard disk image for emulation$ bximage -func create -hd -size=512 -imgmode=flat disk.img

run bochs with a custom configuration file$ bochs -f bochsrc.txt

emulate windows 95 with specific memory and cpu settings$ bochs -q

debug x86 assembly code in an emulated environment$ bochs -dbg