The code itself was patterned so that most control codes were together, and all graphic codes were together, for ease of identification. The first two columns (32 positions) were reserved for control characters.:220, 2368,9) The "space" character had to come before graphics to make sorting easier, so it became position 20hex;:23710 for the same reason, many special signs commonly used as separators were placed before digits. The committee decided it was important to support uppercase 64-character alphabets, and chose to pattern ASCII so it could be reduced easily to a usable 64-character set of graphic codes,:228, 23714 as was done in the DEC SIXBIT code. Lowercase letters were therefore not interleaved with uppercase. To keep options available for lowercase letters and other graphics, the special and numeric codes were arranged before the letters, and the letter A was placed in position 41hex to match the draft of the corresponding British standard.:23818 The digits 09 were arranged so they correspond to values in binary prefixed with 011, making conversion with binary-coded decimal straightforward.
Try to answer this question if possible (otherwise reply "unanswerable"): How many positions are are in the first numeric codes?
unanswerable