Disk Operating System

USB Universal Serial Bus:

          Keyboard is a standard I/p device. The key board is essential device for all computers.

I. Types of Keyboard (based on Switches)

1. Mechanical Keyboard
2. Maintain Keyboard

II. Types of Keyboard based on connector

1. Normal Key Board (5 pins)
2. PS – Keyboard

III. USB Universal Serial Bus

Normal keyboard (working of pins)

1. Pin 1: Keyboard clock
2. Pin 2: Data transfer
3. Pin 3: Unused
4. Pin 4: Ground
5. Pin 5: +5 V

PS – 2 Keyboard (working of pins)

1. Pin 1: Keyboard data
2. Pin 2: Unused
3. Pin 3: Ground
4. Pin 4: + 5 V D.C
5. Pin 5: Clock
6. Pin 6: Unused

Types of keyboard based on numbers of key

1. PC extended technology. It contains 83 keys
2. PC AT (Advance Technology). It contains 83
3. Cursor added keyboard (Track board KB). It contains 101 keys (In first time)
4. Windows key added keyboard. It contains 104/105 keys
5. Power Management keyboard 108 keys
6. Multimedia or internet keyboard 125/130 keys

Types of Keys

1. Type writer alphabetic key A to Z
2. Numeric keys (0 – 9)
3. Control keys (control – Alter, Esc, Enter)
4. Cursor movement key or Eruo keys

Function keys (F1 to F12)

1. Toggle key (caps lock)
2. Special character keys

Mouse

          Mouse is a pointing I/p device types of mouse based on technology.

1. Mechanical mouse
2. Optical mouse
3. Opto Mechanical mouse

Types of mouse based on interface

1. Serial mouse
2. PS – 2 mouse
3. Bus mouse
4. USB mouse
5. Wireless mouse

Types of mouse based on buttons

1. Single button mouse
2. Two button mouse
3. Three button mouse

PS 2 Propretor System

Switches

DIR/P

          It shows list of files and directory in poglio

DIR/W

          It will displace file and directory in width with or in wide screen without three information.

Order by : ( /o)

DIR/ON: To display files and directory in ascending order by file names

DIR/OE: To display files and directory in ascending order by there extension name

DIR/OD: It will shows file and directory in ascending order by there date of creation

DIR/OS: It will show file and directory in reverse order

Syntax:

MD (Make Directory) ß Very Important

C:\> MD file name

C:\> MDDIR filename

C:\> CD file name

C:\> CHDIR filename

CD. To come out to previous directory

CD\ To come out to root directory

C:\> RD xy

Or

C:\> RMDIR xyz

RD  command the directory will be deleted.

Wild Card Characters

1. * - Any characters
2. ? one character
3. DIR ?? .***

C:\> label

C:\> type 1231

C:\> Tree switch

/p