> 
> In the 1970s, I had a VT50a at home 12 lines @ 80 cols upper case only.
> I used it with a self make 300 baud modem and later got a lower case character 
> ROM to sold un top of the upper case character ROM.

The most annoying terminal I ever used was a HeathKit thing that not only wouldn’t display lowercase letters, it didn’t just display the upper case version of the character.
If you sent it a lower case letter, it printed gibberish.   It was a good thing that the UNIX TTY driver LCASE mode output uppercase.

The thing also had a keyboard of identical keys and the assembler was given stickers for each letter to stick to each one.