Page "ASCII" Paragraph 13
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The code itself was patterned so that most control codes were together, and all graphic codes were together, for ease of identification.
The " space " character had to come before graphics to make sorting easier, so it became position 20 < sub > hex </ sub >; for the same reason, many special signs commonly used as separators were placed before digits.
The committee decided it was important to support upper case 64-character alphabets, and chose to pattern ASCII so it could be reduced easily to a usable 64-character set of graphic codes.
To keep options available for lower case letters and other graphics, the special and numeric codes were arranged before the letters, and the letter " A " was placed in position 41 < sub > hex </ sub > to match the draft of the corresponding British standard.
The digits 0 – 9 were arranged so they correspond to values in binary prefixed with 011, making conversion with binary-coded decimal straightforward.
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