They only keyboards I can think of that are not
lowercase today is
 your TTY's. 
I don't recall seeing a computer keyboard that *is* lowercase, ever.
Modern keyboards are generally connected to systems that map alphabetic
keystrokes to uppercase and lowercase depending on other state, and
have keys ("Shift") designed to provide that state, but the keyboards
themselves have only one case of alphabetic key, and in every case I
can recall seeing, that case is upper.
/~\ The ASCII                           der Mouse
\ / Ribbon Campaign
 X  Against HTML               mouse at rodents.montreal.qc.ca
/ \ Email!           7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B