int 19 should just execute code in the BIOS that triggers a reboot. Setting CS and jumping is re-entering the BIOS at the same entry point as at power-on. The B

int 19 should just execute code in the BIOS that triggers a reboot. Setting CS and jumping is re-entering the BIOS at the same entry point as at power-on. The BIOS should then reinit all the hardware.