MSDOS

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MS-DOS

• In the 1980s or early 1990s, the operating
  system that shipped with most PCs was a version
  of the Disk Operating System (DOS) created by
  Microsoft MS-DOS.

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MS-DOS

• MS-DOS is a disk operating system for IBM
  PCcompatible computers.
• In its day, it was easily the most popular
  operating system in the world. It also is the
  basis from which Windows 9x derives its
  under-lying organization.

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MS-DOS

• As with any other operating system, its function
  is to oversee the operation of the system by
  providing support for executing programs,
  controlling I/O devices, handling errors, and
  providing the user interface.

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MS-DOS

• MS-DOS is a disk-based, single-user, single-task
  operating system. These qualities make it one of
  the easiest disk operating systems to understand.

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MS-DOS

• The main portions of MS-DOS are the IO.SYS,
  MSDOS.SYS, and COMMAND.COM files.
• IO.SYS and MSDOS.SYS are special, hidden system
  files

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MS-DOS

• The IO.SYS file moves the systems basic I/O
  functions into memory and then implements the
  MS-DOS default control programs, referred to as
  device drivers, for various hardware components.
• These include the following
• The boot disk drive
• The console display and keyboard
• The systems time-of-day clock
• The parallel and serial communications port

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MS-DOS

• The MSDOS.SYS file provides default support
  features for software applications.
• These features include the following
• Memory management
• Character input and output
• Real-time clock access
• File and record management
• Execution of other programs

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MS-DOS

• The COMMAND.COM command interpreter accepts
  commands issued through the keyboard, or other
  input device, and carries them out according to
  the commands definition.

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MS-DOS

• When DOS runs an application, COMMAND.COM finds
  the program, loads it into memory, and then gives
  it control of the system. When the program is
  shut down, it passes control back to the command
  interpreter.

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MS-DOS

• The remainder of the operating system is
  comprised of utility programs to carry out DOS
  operations, such as formatting disks (FORMAT),
  printing files (PRINT), and copying files (XCOPY).

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Dos Commands

• MS-DOS Commands
• A command is the name of a special program that
  makes your computer carry out a task. There are
  two types of MS-DOS commands - internal and
  external

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Internal Dos Commands

• Internal commands are built into the operating
  system as part of a file called COMMAND.COM (or,
  on a 2000 or XP machine CMD.EXE) . They are
  loaded into memory whenever you switch on your
  computer. When you type an internal command,
  MS-DOS performs it immediately.

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External Dos Commands

• Files with extension COM or EXE are external
  commands. Because these commands are files, they
  are not built into the operating system ( these
  are the commands that alter between versions of
  MS-DOS) .

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Internal DOS Commands

• DIR
• TYPE
• COPY
• REN
• MD
• CD
• CD..
• CD\
• DEL

• DATE
• TIME
• VER
• VOL
• CLS
• PROMPT
• CD
• RD
• EXIT
• COPY CON

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External DOS Commands

• APPEND
• EDIT
• RESTORE
• ATTRIB
• LABEL
• BACKUP
• MODE
• SORT
• CHKDSK
• FIND

• PRINT
• DELTREE
• XCOPY
• REPLACE
• DISKCOPY
• SYS
• COMP
• FORMAT

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