ASCII Extended Character Set – ASCII -I & ASCII -II

Table ASCII -I

TABLE ASCII -II

Use of Character Set

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ASCII Extended Character Set – ASCII-I and ASCII-II

1. ASCII (American Standard Code for Information Interchange)

  • A 7-bit character set (values 0–127).
  • Defines letters (A–Z, a–z), digits (0–9), punctuation, control codes (like carriage return, line feed), etc.
  • Example:
    • A = 65
    • a = 97
    • 0 = 48

2. Extended ASCII

  • Since ASCII only covers 128 characters, many systems extended it to 8 bits (0–255).
  • These “extended” sets are not standardized—they vary by system/region.
    • IBM PC (Code Page 437): added box-drawing characters, Greek letters, math symbols.
    • ISO/IEC 8859 series: different 8-bit encodings for different languages (Latin-1, etc.).
    • Windows-1252: Microsoft’s extension of Latin-1.

3. ASCII-I & ASCII-II

These terms are a bit historical/contextual, but usually mean:

  • ASCII-I (Basic ASCII / Standard ASCII):
    • The original 7-bit ASCII (0–127).
    • Sometimes called “US-ASCII”.
    • Covers only English letters, digits, and basic symbols.
  • ASCII-II (Extended ASCII):
    • The 8-bit versions (0–255).
    • Includes the original 128 characters plus an extended range (128–255).
    • What’s inside depends on the code page (Latin-1, CP437, etc.).

✅ Summary:

  • ASCII-I = Standard 7-bit ASCII (0–127).
  • ASCII-II = Extended ASCII (128–255, system-dependent).