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* convert a null terminated string to all uppercase

* OTHER MODULES NEEDED: TO_UPPER

* ENTRY: X=start of string

* EXIT:  all registers (except CC) preserved


 nam Convert String to Uppercase
 ttl Assembler Library Module


 psect TO_UPPRS,0,0,0,0,0

TO_UPPRS:
 pshs cc,b,x

loop
 ldb ,x get char to check
 beq exit exit if all done
 bsr TO_UPPER convert to upper 
 stb ,x+ put back in string
 bra loop

exit
 puls cc,b,x,pc

 endsect