Sets a specified range of hexadecimal values to be alphabetic for the executing process.
TCL-II command.
SET-ALPHA ({n-m} {C}
m is the last hexadecimal value in the range.
n is the first hexadecimal value in the range.
C Clears X'80'-X'FF' to non-alphabetic.
m > n, n > X'7F', m <= X'F8'.
Refer to the description of LOAD-ALPHA for more details.