Four-Column ASCII Table Reveals Encoding Patterns and Relationships
By
tempodox
Crisp on the outside, thoughtful on the inside. A keeper.
Summary
The article discusses a four-column ASCII table format shared on Hacker News that reveals patterns in ASCII encoding, making relationships between characters more obvious. It explains how this layout clarifies why certain control codes work the way they do (like ^[ becoming escape), shows the mathematical relationship between uppercase/lowercase letters (40h + ordinal position for uppercase, 60h for lowercase), and demonstrates the bit-level patterns in ASCII encoding.
Key quotes
· 4 pulledI always thought it was a shame the ascii table is rarely shown in columns (or rows) of 32, as it makes a lot of this quite obvious.
It becomes immediately obvious why, eg, ^[ becomes escape.
Or that the alphabet is just 40h + the ordinal position of the letter (or 60h for lower-case).
Or that we shift between upper & lower-case by just flipping one bit.
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