You can configure bochs to run from a floppy image. Some required settings:
floppya: image=bootdisk.img, status=inserted boot: floppyNext run bochs:
$ bochs -q
You will see bochs boot and the emulated x86 PC is displayed:
Enable the GUI debugger by using the following in the configuration file bochsrc.txt (note that this feature is not always compiled in):
display_library: x, options="gui_debug"
Now a debug window show up:
Now bochs will brake when the instruction:
xchg bx, bx
which does nothing, but bochs detects this and stops and enters the debugger.