My first terminal was a Lear Siegler ADM 1A and it did not do lower case. https://terminals-wiki.org/wiki/index.php/Lear_Siegler_ADM-1 https://terminals-wiki.or

My first terminal was a Lear Siegler ADM 1A and it did not do lower case. https://terminals-wiki.org/wiki/index.php/Lear_Siegler_ADM-1 https://terminals-wiki.org/wiki/index.php/Lear_Siegler_ADM-1 The Teletype ASR-33, which was one of the most common "consoles" for early computers, also did not do lower case. https://en.wikipedia.org/wiki/Teletype_Model_33 https://en.wikipedia.org/wiki/Teletype_Model_33 So the answer to the article's question is: The hardware of the day did not support it.