DOS Operating Systems

The operating system is the software on the computer system. At the present time on the computer operating system developed very rapidly since the discovery of the operating system with a text-based interface. DOS (Disk Operating System) is a text-based operating systems that are rarely used at the present time because humans are more like an operating system with a graphical interface (GUI). Examples related to the operating system DOS is MS DOS (Microsoft), Novell DOS, ROM Dos, IBM PC DOS, DR DOS, Free DOS, DOS PTR, OPEN DOS, Caldera DOS and others.
DOS has the following characteristics:

Text-based interface or the command
 
     Signs of readiness to take orders from the so-called prompt
     Single tasking that can only run one program at a time
     Running the processor to real mode
     Single User which can only be used by one user at a time.

Currently the DOS operating system is very rarely encountered because most people prefer a GUI-based operating systems such as Microsoft Windows, Linux and Mac OS.