A86: Typing in letters

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A86: Typing in letters

 Is there an easier way to detect a person pressing a any letter on the the calc and then displaying that letter rather than going through and checking for every letter like so
 
call GET_KEY
cp ka
jr z, Dispa
cp kb
jr z, Dispb    ;and so on...
 
Dispa:
    call _puts "a"
 
or whatever the rom call would be
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