[Braillenote] 6 dot Braille

[beth]

While researching computers, I read the BN manuals concerning the Braille
keyboard models and I don't have this exactly right, since I haven't read it
enough times yet, but it's good enough for my question.  When in six dot
Braille, you must do something like a chord U before each letter you want
capitalized and, I think, two chord U's for a string of capitalized letters.
Why?  Whatever happened to using the dot 6 on the machine?  I'm puzzled.
Beth