I've always wondered what the lowercase/shiftkey modification is. Obviously it adds lowercase characters to the otherwise uppercase Apple II, but how does it relate to my II+ clone? Let me explain.
My clone keyboard (partly pictured below) has a lockable pushbutton switch with a red LED in place of the regular "Power" light. In normal 40 column mode nothing happens when you press it, but in 80-column mode (Videx Videoterm card) I get lowercase letters when it's pressed down, and to get uppercase you use the SHIFT key.
Do I in essence already have that lowercase modification, or is it something different?