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 Which of the following uses a unique eight-bit binary code for each number and alphabetic character as well as punctuation marks and accented letters and non-alphabetic characters?
1. Scan code
2. Unicode
3. ASCII
4. EBCDIC
5. Both 1 and 2

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Correct Answer - Option 4 : EBCDIC

The correct answer is EBCDIC.

  • EBCDIC is a full Extended binary-coded decimal interchange code.
    • Data-encoding system, developed by IBM, that uses a unique eight-bit binary code for each number and alphabetic character as well as punctuation marks and accented letters and non-alphabetic characters.
    • It was created to extend the existing Binary-Coded Decimal (BCD) Interchange Code, or BCDIC, which itself was devised as an efficient means of encoding the two-zone and number punches on punched cards into six bits.
  • Hence, the correct option is 4.

 

  • ASCII Code 
    • ASCII stands for American Standard Code for Information Interchange.
    • It's a 7-bit character code where every single bit represents a unique character.
  • Unicode
    • The Unicode Standard consists of a set of code charts for visual reference, an encoding method and set of standard character encodings, a set of reference data files, and a number of related items, such as character properties, rules for normalization, decomposition, collation, rendering, and bidirectional text display order.
  • Keyboard scancodes
    • The data from a keyboard comes mainly in the form of scancodes, produced by keypresses, or used in the protocol with the computer.
    • Different codes are used by the keyboard firmware internally, and they also exist several sets of scancodes.
      • Escape scancodes
        • The codes e0 and e1 introduce scancode sequences and are not usually used as isolated scancodes themselves.
      • Ordinary scancodes
        • The scancodes in translated scancode set 2 are given in hex.
          • Between parentheses the keycap on a US keyboard.
          • The scancodes are given in order, grouped according to groups of keys that are usually found next to each other.
        • 00 is normally an error code
        • 01 (Esc)
      • Escaped scancodes
        • Apart from the Pause/Break key, which has an escaped sequence starting with e1, the escape used is e0.
          • Often, the codes are chosen in such a way that something meaningful happens when the receiver just discards the e0

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