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

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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.

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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.).

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✅ Summary:

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