The computer which is IBM PC compatible and running MS-DOS is emulated by an emulator, DOSBox. It is more useful in old PC games. The capability of it to capture the screenshot and game play footage recording, are the most popular feature of it. The videos are usually compressed, since in the uncompressed state it has the footage replica of the program. Depending upon the components ability to replicate, DOSBox can be differentiated from other emulators. Serial ports timing-compatible implementation is capable by DOSBox and it can run depending on software and hardware, but when emulator is used USB devices can replace the older serial ports.