Many early character sets (CDC Display Code, UNIVAC's Fieldata) were only 6 bits wide, so there wasn't room for two cases of the letters until 8-bit EBCDIC and

Many early character sets (CDC Display Code, UNIVAC's Fieldata) were only 6 bits wide, so there wasn't room for two cases of the letters until 8-bit EBCDIC and 7-bit ASCII came along.