HISTORY OF DOS

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HISTORY OF DOS

          The MS – DOS was developed in the years as shown below;
1981   :         MS-DOS 1.0 was released August 1981
1982   :         MS-DOS 1.25 was released August 1982
1983   :         MS-DOS 2.0 was released March 1983
1984   :         Microsoft introduces MS-DOS 3.0 for the IBM PC AT and MS-DOS 3.2             for N/w
1986   :         MS-DOS 3.2 was released April 1986
1987   :         MS-DOS 3.3 was released April 1987
1988   :         MS-DOS 4.0 was released July 1988
1991   :         MS-DOS 5.0 was released June 1991
1993   :         MS-DOS 6.0 was released August 1993
1994   :         MS-DOS 6.21 was released March 1994
1994   :         MS-DOS 6.22 was released April 1994

Keyboard: Keyboard is standard I/p device
There are three types of keyboards
  1. Opto electronic type keyboard
  2. Mechanical type keyboard
  3. Membrane type keyboard
Types of keyboard based on connector
Normal Keyboard (5 pin connector keyboard)
  1. Keyboard clock
  2. Keyboard of data
  3. Unused
  4. Ground
  5. + 5 V D.C
PS2 Keyboard
  1. KB data
  2. Unused
  3. Ground
  4. +5 V D.C
  5. KB Clock
  6. Unused
USB Keyboard or HID (Human Interface Device)
Types of keys based on keys
  1. PC – XT (intended technology): It contains 83 keys
  2. PC – AT (advance technology): It contains 84 keys
  3. Cursor added keyboard or track ball keyboard: It contains 101 keys
  4. Windows key added : It contains 104/105 keys
  5. Power management added kb : It contains 108 keys
  6. Multimedia or internet keyboard: It contains upto 125 to 130 last keys

Types of keys
  1. Type writer or alphabetic keys (A to Z)
  2. Numeric keys (0 to 9)
  3. Control Keys (Ctrl, Alt, Esc, Enter)
  4. Cursor movement key or arrow keys
  5. Function keys F1 to F12
  6. Toggle key (Caps lock, Num lock, Scroll lock)
  7. Special characters keys (&, *, ( ), { })

Mouse
Communication mouse
There are two types of communication part
  1. Serial
  2. Parallel
Mouse is a pointing input device.
Types of mouse based on technology.
  1. Mechanical mouse
  2. Optical mouse or optic mouse
  3. opto mechanical mouse

Type of Mouse based on Interface
  1. Serial mouse
  2. PS 2 mouse
  3. Bus mouse
  4. USB mouse
  5. Wireless mouse
Type of Mouse based on Buttons
  1. Single Button Mouse
  2. Two Button Mouse
  3. Three Button Mouse

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