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ASCII - American Standard Code
for Information Interchange. A coding standard for characters,
numbers, and symbols.
The first 32 characters, ASCII codes 0 through 1Fh, form a
special set of non-printing characters called the control characters. We call
them control characters because they perform various printer/display control
operations rather than displaying symbols.
The second group of 32 ASCII character codes comprises
various punctuation symbols, special characters, and the numeric digits.
The third group of 32 ASCII characters is reserved for the
upper case alphabetic characters.
The fourth, and final group of 32 ASCII character codes is
reserved for the lower case alphabetic symbols, five additional special
symbols, and another control character (delete).
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