date of birth of the DOS operating system can be considered in 1980, when it created the first development, bearing the name QDOS.The most widely used system has received in 1987 and used until now.
operating system DOS: general characteristics
system (OS) of a computer is the software loaded on your PC.It carries out a dialogue with a person makes PC management and its resources, executes various programs.Due to the operating system and user application programs can comfortably communicate with your PC devices (interface).
core of the system is MSDOS files MSDOS.SYS and I0.SYS, which are loaded into memory by a loader and constantly present there.The first file implements a high-level basic services MSDOS, and the other is complementary to the basic input output system.
processing commands entered by the user is done via the command processor, which is implemented through COMMAND.SOM file located on a disk with the kernel.Some commands in DOS, such as DIR, TYPE, and others, are performed by the command processor.They are called internal commands.The rest of the external commands are made via external files that are loaded into memory and run as through COMMAND.SOM.After the end of the program the processor produces the removal of program memory and reports ready for further implementation of the actions of the user.
External team that executes the operating system DOS, available as separate files with the system.They produce actions different service nature (check disk, formatting, etc..).
addition to the system input output MSDOS are device drivers that provide a non-standard use of existing devices or new service.These programs are loaded into the PC memory with the system, and their names are written in a special configuration file CONFIG.SYS.This makes it easier to add new devices without using the system MSDOS files.
operating system DOS: the basic functions
main responsibility is the maintenance of the system (creation, storage, delete) files, which are similar to any other, and is a set of specific data memory space.When processing files are loaded into memory, and it is under the control of the system (OS).
Each file must have a name that can be complex and simple.The complex is represented by the name of the file name and extension.Unlike other systems, higher-level (Windows), from MS-DOS file name can have no more than eight characters.The file extension indicates the type or belonging to a particular program, such as a data file or text.
Of course, compared with windose MS DOS - it's a completely different interface.If the first system all the tools and all information is presented graphically on the computer screen, the work in DOS system is more complex and requires special skills and knowledge of commands.
as the interface when working in DOS system before the user receive a black screen with only one command line.And, for example, to load a program or game (supported by the system) will need to enter a few commands.
After the program Norton Commander to work in MS-DOS system has become much easier.Also, DOS operating system performs a single-tasking system, and does not allow unlike Vindovs work with two or more programs simultaneously.However, this system is still in use and allows you to solve various specific tasks.From under DOS launch a program for the recovery, to check memory and address other "iron" problems.
