Group 2

The second group of 32 ASCII character codes comprise various punctuation symbols, special characters, and the numeric digits. The most notable characters in this group include the:

• space character (ASCII code 20h)
• numeric digits 0 through 9 (ASCII codes 30h through 39h)

Note that the numeric digits differ from their numeric values only in the high order nibble. By subtracting 30h from the ASCII code for any particular digit you can obtain the numeric equivalent of that digit.

Group 3

The third group of 32 ASCII characters is reserved for the upper case alphabetic characters.

The ASCII codes for the characters "A" through "Z" lie in the range 41h through 5Ah. Since there are only 26 different alphabetic characters, the remaining six codes hold various special symbols.

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