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Comment by Ballas

4 hours ago

That is so strange. If it were 9-bit bytes, that would make sense: 8bits+parity. Then a word is just 32bits+4 parity.

7 bits matches ASCII, so you can implement entire ASCII character set, and simultaneously it means you get to fit one more character per byte.

Using RADIX-50, or SIXBIT, you could fit more but you'd lose ASCII-compatibility