LOWER LOOP_MAGIC LOWER-CASE
LOWER ( addr cnt -- )  
<FORTH-83-L&P>
convert string to lower case This is not in L&P's F83 but provided for symmetry 
 simulate:
   : LOWER  0 DO  DUP I +  DUP C@ >R _tolower SWAP C!  LOOP  DROP ;

reference: p4_lower in ../src/lpf83.c:0218, export CO LOWER